172820412 has 96 divisors (see below), whose sum is σ = 474163200. Its totient is φ = 54345600.

The previous prime is 172820399. The next prime is 172820423. The reversal of 172820412 is 214028271.

172820412 is a `hidden beast` number, since 172 + 82 + 0 + 412 = 666.

172820412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136639 + ... + 137897.

It is an arithmetic number, because the mean of its divisors is an integer number (4939200).

Almost surely, 2^172820412 is an apocalyptic number.

172820412 is a gapful number since it is divisible by the number (12) 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 172820412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237081600).

172820412 is an abundant number, since it is smaller than the sum of its proper divisors (301342788).

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

172820412 is a wasteful number, since it uses less digits than its factorization.

172820412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344 (or 1336 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 172820412 is about 13146.1177539226. The cubic root of 172820412 is about 557.0125906773.

Adding to 172820412 its reverse (214028271), we get a palindrome (386848683).

The spelling of 172820412 in words is "one hundred seventy-two million, eight hundred twenty thousand, four hundred twelve".