90639055 has 16 divisors (see below), whose sum is σ = 119861280. Its totient is φ = 65374848.

The previous prime is 90639047. The next prime is 90639119. The reversal of 90639055 is 55093609.

It is a cyclic number.

It is not a de Polignac number, because 90639055 - 2³ = 90639047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13420 + ... + 19009.

It is an arithmetic number, because the mean of its divisors is an integer number (7491330).

Almost surely, 2^90639055 is an apocalyptic number.

90639055 is a deficient number, since it is larger than the sum of its proper divisors (29222225).

90639055 is a wasteful number, since it uses less digits than its factorization.

90639055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32490.

The product of its (nonzero) digits is 36450, while the sum is 37.

The square root of 90639055 is about 9520.4545584757. The cubic root of 90639055 is about 449.1986644070.

The spelling of 90639055 in words is "ninety million, six hundred thirty-nine thousand, fifty-five".