90634639 has 2 divisors, whose sum is σ = 90634640. Its totient is φ = 90634638.

The previous prime is 90634627. The next prime is 90634711. The reversal of 90634639 is 93643609.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90634639 - 2¹⁹ = 90110351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90634619) 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 as a sum of consecutive naturals, namely, 45317319 + 45317320.

It is an arithmetic number, because the mean of its divisors is an integer number (45317320).

Almost surely, 2^90634639 is an apocalyptic number.

90634639 is a deficient number, since it is larger than the sum of its proper divisors (1).

90634639 is an equidigital number, since it uses as much as digits as its factorization.

90634639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 90634639 is about 9520.2226339514. Note that the first 3 decimals coincide. The cubic root of 90634639 is about 449.1913691945.

The spelling of 90634639 in words is "ninety million, six hundred thirty-four thousand, six hundred thirty-nine".