172115640 has 48 divisors (see below), whose sum is σ = 559377000. Its totient is φ = 45897408.

The previous prime is 172115617. The next prime is 172115651. The reversal of 172115640 is 46511271.

It is a happy number.

172115640 is a `hidden beast` number, since 1 + 7 + 2 + 1 + 15 + 640 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238690 + ... + 239409.

Almost surely, 2^172115640 is an apocalyptic number.

172115640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172115640 is an abundant number, since it is smaller than the sum of its proper divisors (387261360).

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

172115640 is a wasteful number, since it uses less digits than its factorization.

172115640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478116 (or 478109 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 172115640 is about 13119.2850414952. The cubic root of 172115640 is about 556.2543821563.

The spelling of 172115640 in words is "one hundred seventy-two million, one hundred fifteen thousand, six hundred forty".