28601780172 has 96 divisors (see below), whose sum is σ = 76983373824. Its totient is φ = 8095982400.

The previous prime is 28601780159. The next prime is 28601780173. The reversal of 28601780172 is 27108710682.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (28601780173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4528897 + ... + 4535207.

It is an arithmetic number, because the mean of its divisors is an integer number (801910144).

Almost surely, 2^28601780172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28601780172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38491686912).

28601780172 is an abundant number, since it is smaller than the sum of its proper divisors (48381593652).

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

28601780172 is a wasteful number, since it uses less digits than its factorization.

28601780172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6819 (or 6817 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 42.

The spelling of 28601780172 in words is "twenty-eight billion, six hundred one million, seven hundred eighty thousand, one hundred seventy-two".