172861256328 has 16 divisors (see below), whose sum is σ = 432153140880. Its totient is φ = 57620418768.

The previous prime is 172861256299. The next prime is 172861256341. The reversal of 172861256328 is 823652168271.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3601276150 + ... + 3601276197.

It is an arithmetic number, because the mean of its divisors is an integer number (27009571305).

Almost surely, 2^172861256328 is an apocalyptic number.

It is an amenable number.

172861256328 is an abundant number, since it is smaller than the sum of its proper divisors (259291884552).

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

172861256328 is a wasteful number, since it uses less digits than its factorization.

172861256328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7202552356 (or 7202552352 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The spelling of 172861256328 in words is "one hundred seventy-two billion, eight hundred sixty-one million, two hundred fifty-six thousand, three hundred twenty-eight".