27997521400 has 48 divisors (see below), whose sum is σ = 65183383800. Its totient is φ = 11183671680.

The previous prime is 27997521389. The next prime is 27997521401. The reversal of 27997521400 is 412579972.

It is a happy number.

It is a super-2 number, since 2×27997521400² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997521401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51111 + ... + 242089.

Almost surely, 2^27997521400 is an apocalyptic number.

27997521400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27997521400 is an abundant number, since it is smaller than the sum of its proper divisors (37185862400).

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

27997521400 is a wasteful number, since it uses less digits than its factorization.

27997521400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191728 (or 191719 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 27997521400 in words is "twenty-seven billion, nine hundred ninety-seven million, five hundred twenty-one thousand, four hundred".