90215884 has 12 divisors (see below), whose sum is σ = 172230408. Its totient is φ = 41007200.

The previous prime is 90215869. The next prime is 90215887. The reversal of 90215884 is 48851209.

It is not an unprimeable number, because it can be changed into a prime (90215887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025137 + ... + 1025224.

It is an arithmetic number, because the mean of its divisors is an integer number (14352534).

Almost surely, 2^90215884 is an apocalyptic number.

It is an amenable number.

90215884 is a deficient number, since it is larger than the sum of its proper divisors (82014524).

90215884 is a wasteful number, since it uses less digits than its factorization.

90215884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050376 (or 2050374 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 90215884 is about 9498.2042513309. The cubic root of 90215884 is about 448.4985083803.

The spelling of 90215884 in words is "ninety million, two hundred fifteen thousand, eight hundred eighty-four".