172612894428 has 120 divisors (see below), whose sum is σ = 486438876000. Its totient is φ = 53058810240.

The previous prime is 172612894411. The next prime is 172612894429. The reversal of 172612894428 is 824498216271.

172612894428 is a `hidden beast` number, since 1 + 7 + 2 + 6 + 128 + 94 + 428 = 666.

172612894428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×172612894428² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172612894429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4322698 + ... + 4362446.

It is an arithmetic number, because the mean of its divisors is an integer number (4053657300).

Almost surely, 2^172612894428 is an apocalyptic number.

172612894428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172612894428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243219438000).

172612894428 is an abundant number, since it is smaller than the sum of its proper divisors (313825981572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172612894428 is a wasteful number, since it uses less digits than its factorization.

172612894428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40809 (or 40798 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The spelling of 172612894428 in words is "one hundred seventy-two billion, six hundred twelve million, eight hundred ninety-four thousand, four hundred twenty-eight".