7668818640 has 160 divisors (see below), whose sum is σ = 30188424960. Its totient is φ = 1752869376.

The previous prime is 7668818581. The next prime is 7668818659. The reversal of 7668818640 is 468188667.

It is a super-2 number, since 2×7668818640² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238479 + ... + 268718.

It is an arithmetic number, because the mean of its divisors is an integer number (188677656).

Almost surely, 2^7668818640 is an apocalyptic number.

7668818640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7668818640 is an abundant number, since it is smaller than the sum of its proper divisors (22519606320).

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

7668818640 is a wasteful number, since it uses less digits than its factorization.

7668818640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507226 (or 507214 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 7668818640 is about 87571.7913485844. The cubic root of 7668818640 is about 1972.0117081320.

The spelling of 7668818640 in words is "seven billion, six hundred sixty-eight million, eight hundred eighteen thousand, six hundred forty".