7664657638 has 24 divisors (see below), whose sum is σ = 13380554376. Its totient is φ = 3278996160.

The previous prime is 7664657617. The next prime is 7664657639. The reversal of 7664657638 is 8367564667.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664657639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 927420 + ... + 935647.

It is an arithmetic number, because the mean of its divisors is an integer number (557523099).

Almost surely, 2^7664657638 is an apocalyptic number.

7664657638 is a deficient number, since it is larger than the sum of its proper divisors (5715896738).

7664657638 is a wasteful number, since it uses less digits than its factorization.

7664657638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863108 (or 1863097 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 58.

The square root of 7664657638 is about 87548.0304632834. The cubic root of 7664657638 is about 1971.6549809067.

The spelling of 7664657638 in words is "seven billion, six hundred sixty-four million, six hundred fifty-seven thousand, six hundred thirty-eight".