7688660638 has 16 divisors (see below), whose sum is σ = 11761200000. Its totient is φ = 3768624472.

The previous prime is 7688660633. The next prime is 7688660659. The reversal of 7688660638 is 8360668867.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7688660633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48388 + ... + 133111.

It is an arithmetic number, because the mean of its divisors is an integer number (735075000).

Almost surely, 2^7688660638 is an apocalyptic number.

7688660638 is a deficient number, since it is larger than the sum of its proper divisors (4072539362).

7688660638 is a wasteful number, since it uses less digits than its factorization.

7688660638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181919.

The product of its (nonzero) digits is 13934592, while the sum is 58.

The square root of 7688660638 is about 87685.0080572500. The cubic root of 7688660638 is about 1973.7110117660.

The spelling of 7688660638 in words is "seven billion, six hundred eighty-eight million, six hundred sixty thousand, six hundred thirty-eight".