90515557 has 16 divisors (see below), whose sum is σ = 104509440. Its totient is φ = 77585200.

The previous prime is 90515543. The next prime is 90515587. The reversal of 90515557 is 75551509.

It is a de Polignac number, because none of the positive numbers 2^k-90515557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90515507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15444 + ... + 20482.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^90515557 is an apocalyptic number.

It is an amenable number.

90515557 is a deficient number, since it is larger than the sum of its proper divisors (13993883).

90515557 is a wasteful number, since it uses less digits than its factorization.

90515557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144.

The product of its (nonzero) digits is 39375, while the sum is 37.

The square root of 90515557 is about 9513.9664178512. The cubic root of 90515557 is about 448.9945568393.

The spelling of 90515557 in words is "ninety million, five hundred fifteen thousand, five hundred fifty-seven".