90557815 has 8 divisors (see below), whose sum is σ = 108721008. Its totient is φ = 72411840.

The previous prime is 90557813. The next prime is 90557849. The reversal of 90557815 is 51875509.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90557815 - 2¹ = 90557813 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 (90557813) 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 7 ways as a sum of consecutive naturals, for example, 15900 + ... + 20830.

It is an arithmetic number, because the mean of its divisors is an integer number (13590126).

Almost surely, 2^90557815 is an apocalyptic number.

90557815 is a deficient number, since it is larger than the sum of its proper divisors (18163193).

90557815 is a wasteful number, since it uses less digits than its factorization.

90557815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8609.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 90557815 is about 9516.1869990033. The cubic root of 90557815 is about 449.0644183479.

The spelling of 90557815 in words is "ninety million, five hundred fifty-seven thousand, eight hundred fifteen".