90088639 has 4 divisors (see below), whose sum is σ = 90143424. Its totient is φ = 90033856.

The previous prime is 90088637. The next prime is 90088717. The reversal of 90088639 is 93688009.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90088639 - 2¹ = 90088637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90088595 and 90088604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90088637) 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 in 3 ways as a sum of consecutive naturals, for example, 24847 + ... + 28240.

It is an arithmetic number, because the mean of its divisors is an integer number (22535856).

Almost surely, 2^90088639 is an apocalyptic number.

90088639 is a deficient number, since it is larger than the sum of its proper divisors (54785).

90088639 is a wasteful number, since it uses less digits than its factorization.

90088639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54784.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 90088639 is about 9491.5035163034. The cubic root of 90088639 is about 448.2875475816.

The spelling of 90088639 in words is "ninety million, eighty-eight thousand, six hundred thirty-nine".