89908639 has 2 divisors, whose sum is σ = 89908640. Its totient is φ = 89908638.

The previous prime is 89908591. The next prime is 89908667. The reversal of 89908639 is 93680998.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89908639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (89908669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44954319 + 44954320.

It is an arithmetic number, because the mean of its divisors is an integer number (44954320).

Almost surely, 2^89908639 is an apocalyptic number.

89908639 is a deficient number, since it is larger than the sum of its proper divisors (1).

89908639 is an equidigital number, since it uses as much as digits as its factorization.

89908639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 89908639 is about 9482.0166104052. The cubic root of 89908639 is about 447.9887841978.

The spelling of 89908639 in words is "eighty-nine million, nine hundred eight thousand, six hundred thirty-nine".