27397799838 has 24 divisors (see below), whose sum is σ = 59367197448. Its totient is φ = 9131784912.

The previous prime is 27397799837. The next prime is 27397799843. The reversal of 27397799838 is 83899779372.

It is a super-2 number, since 2×27397799838² (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 (27397799837) 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, 160056 + ... + 283572.

It is an arithmetic number, because the mean of its divisors is an integer number (2473633227).

Almost surely, 2^27397799838 is an apocalyptic number.

27397799838 is an abundant number, since it is smaller than the sum of its proper divisors (31969397610).

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

27397799838 is a wasteful number, since it uses less digits than its factorization.

27397799838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135848 (or 135845 counting only the distinct ones).

The product of its digits is 288054144, while the sum is 72.

The spelling of 27397799838 in words is "twenty-seven billion, three hundred ninety-seven million, seven hundred ninety-nine thousand, eight hundred thirty-eight".