7920634440 has 32 divisors (see below), whose sum is σ = 23761903680. Its totient is φ = 2112169152.

The previous prime is 7920634433. The next prime is 7920634471. The reversal of 7920634440 is 444360297.

It is a super-2 number, since 2×7920634440² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33002524 + ... + 33002763.

It is an arithmetic number, because the mean of its divisors is an integer number (742559490).

Almost surely, 2^7920634440 is an apocalyptic number.

It is an amenable number.

7920634440 is an abundant number, since it is smaller than the sum of its proper divisors (15841269240).

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

7920634440 is a wasteful number, since it uses less digits than its factorization.

7920634440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66005301 (or 66005297 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 7920634440 is about 88997.9462684393. The cubic root of 7920634440 is about 1993.3642108343.

The spelling of 7920634440 in words is "seven billion, nine hundred twenty million, six hundred thirty-four thousand, four hundred forty".