172897655 has 8 divisors (see below), whose sum is σ = 237116832. Its totient is φ = 118558368.

The previous prime is 172897609. The next prime is 172897657. The reversal of 172897655 is 556798271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172897655 - 2¹⁸ = 172635511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172897657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2469932 + ... + 2470001.

It is an arithmetic number, because the mean of its divisors is an integer number (29639604).

Almost surely, 2^172897655 is an apocalyptic number.

172897655 is a deficient number, since it is larger than the sum of its proper divisors (64219177).

172897655 is an equidigital number, since it uses as much as digits as its factorization.

172897655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4939945.

The product of its digits is 1058400, while the sum is 50.

The square root of 172897655 is about 13149.0552892594. The cubic root of 172897655 is about 557.0955648941.

The spelling of 172897655 in words is "one hundred seventy-two million, eight hundred ninety-seven thousand, six hundred fifty-five".