87639659 has 2 divisors, whose sum is σ = 87639660. Its totient is φ = 87639658.

The previous prime is 87639649. The next prime is 87639689. The reversal of 87639659 is 95693678.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87639659 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87639659.

It is not a weakly prime, because it can be changed into another prime (87639649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43819829 + 43819830.

It is an arithmetic number, because the mean of its divisors is an integer number (43819830).

Almost surely, 2^87639659 is an apocalyptic number.

87639659 is a deficient number, since it is larger than the sum of its proper divisors (1).

87639659 is an equidigital number, since it uses as much as digits as its factorization.

87639659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The square root of 87639659 is about 9361.6055781046. The cubic root of 87639659 is about 444.1880730030.

The spelling of 87639659 in words is "eighty-seven million, six hundred thirty-nine thousand, six hundred fifty-nine".