172868418 has 30 divisors (see below), whose sum is σ = 387728649. Its totient is φ = 57567024.

The previous prime is 172868411. The next prime is 172868429. The reversal of 172868418 is 814868271.

172868418 is a `hidden beast` number, since 172 + 8 + 68 + 418 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 118004769 + 54863649 = 10863^2 + 7407^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9297.

It is not an unprimeable number, because it can be changed into a prime (172868411) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 166830 + ... + 167862.

Almost surely, 2^172868418 is an apocalyptic number.

172868418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

172868418 is an abundant number, since it is smaller than the sum of its proper divisors (214860231).

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

172868418 is an frugal number, since it uses more digits than its factorization.

172868418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2080 (or 1038 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 172868418 is about 13147.9434893827. The cubic root of 172868418 is about 557.0641614969.

The spelling of 172868418 in words is "one hundred seventy-two million, eight hundred sixty-eight thousand, four hundred eighteen".