90638687 has 2 divisors, whose sum is σ = 90638688. Its totient is φ = 90638686.

The previous prime is 90638677. The next prime is 90638689. The reversal of 90638687 is 78683609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90638687 - 2¹⁰ = 90637663 is a prime.

Together with 90638689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90638689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45319343 + 45319344.

It is an arithmetic number, because the mean of its divisors is an integer number (45319344).

Almost surely, 2^90638687 is an apocalyptic number.

90638687 is a deficient number, since it is larger than the sum of its proper divisors (1).

90638687 is an equidigital number, since it uses as much as digits as its factorization.

90638687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 90638687 is about 9520.4352316478. The cubic root of 90638687 is about 449.1980564817.

It can be divided in two parts, 906 and 38687, that added together give a palindrome (39593).

The spelling of 90638687 in words is "ninety million, six hundred thirty-eight thousand, six hundred eighty-seven".