90503618 has 4 divisors (see below), whose sum is σ = 135755430. Its totient is φ = 45251808.

The previous prime is 90503617. The next prime is 90503641. The reversal of 90503618 is 81630509.

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

It can be written as a sum of positive squares in only one way, i.e., 78552769 + 11950849 = 8863^2 + 3457^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (90503617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22625903 + ... + 22625906.

Almost surely, 2^90503618 is an apocalyptic number.

90503618 is a deficient number, since it is larger than the sum of its proper divisors (45251812).

90503618 is a wasteful number, since it uses less digits than its factorization.

90503618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45251811.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 90503618 is about 9513.3389511780. The cubic root of 90503618 is about 448.9748151806.

The spelling of 90503618 in words is "ninety million, five hundred three thousand, six hundred eighteen".