172040256 has 42 divisors (see below), whose sum is σ = 493123982. Its totient is φ = 57346560.

The previous prime is 172040249. The next prime is 172040261. The reversal of 172040256 is 652040271.

It can be written as a sum of positive squares in only one way, i.e., 138862656 + 33177600 = 11784^2 + 5760^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148765 + ... + 149916.

Almost surely, 2^172040256 is an apocalyptic number.

172040256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

172040256 is an abundant number, since it is smaller than the sum of its proper divisors (321083726).

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

172040256 is a wasteful number, since it uses less digits than its factorization.

172040256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298699 (or 298686 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 172040256 is about 13116.4117044259. The cubic root of 172040256 is about 556.1731600125.

The spelling of 172040256 in words is "one hundred seventy-two million, forty thousand, two hundred fifty-six".