7957697538 has 32 divisors (see below), whose sum is σ = 18487209600. Its totient is φ = 2236354560.

The previous prime is 7957697513. The next prime is 7957697549. The reversal of 7957697538 is 8357967597.

It is a super-2 number, since 2×7957697538² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1550463 + ... + 1555586.

It is an arithmetic number, because the mean of its divisors is an integer number (577725300).

Almost surely, 2^7957697538 is an apocalyptic number.

7957697538 is an abundant number, since it is smaller than the sum of its proper divisors (10529512062).

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

7957697538 is a wasteful number, since it uses less digits than its factorization.

7957697538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106122.

The product of its digits is 100018800, while the sum is 66.

The square root of 7957697538 is about 89205.9277066272. The cubic root of 7957697538 is about 1996.4685629797.

The spelling of 7957697538 in words is "seven billion, nine hundred fifty-seven million, six hundred ninety-seven thousand, five hundred thirty-eight".