7998156464 has 20 divisors (see below), whose sum is σ = 16407983304. Its totient is φ = 3763838208.

The previous prime is 7998156433. The next prime is 7998156479. The reversal of 7998156464 is 4646518997.

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

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, 14702222 + ... + 14702765.

Almost surely, 2^7998156464 is an apocalyptic number.

It is an amenable number.

7998156464 is an abundant number, since it is smaller than the sum of its proper divisors (8409826840).

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

7998156464 is a wasteful number, since it uses less digits than its factorization.

7998156464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29405012 (or 29405006 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 59.

The square root of 7998156464 is about 89432.4128266704. The cubic root of 7998156464 is about 1999.8463601977.

The spelling of 7998156464 in words is "seven billion, nine hundred ninety-eight million, one hundred fifty-six thousand, four hundred sixty-four".