27997870944 has 24 divisors (see below), whose sum is σ = 73494411480. Its totient is φ = 9332623616.

The previous prime is 27997870931. The next prime is 27997870961. The reversal of 27997870944 is 44907879972.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×27997870944² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145822149 + ... + 145822340.

It is an arithmetic number, because the mean of its divisors is an integer number (3062267145).

Almost surely, 2^27997870944 is an apocalyptic number.

27997870944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

27997870944 is an abundant number, since it is smaller than the sum of its proper divisors (45496540536).

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

27997870944 is a wasteful number, since it uses less digits than its factorization.

27997870944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291644502 (or 291644494 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 66.

The spelling of 27997870944 in words is "twenty-seven billion, nine hundred ninety-seven million, eight hundred seventy thousand, nine hundred forty-four".