90215090 has 64 divisors (see below), whose sum is σ = 200807424. Its totient is φ = 28474368.

The previous prime is 90215089. The next prime is 90215093. The reversal of 90215090 is 9051209.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (90215093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55124 + ... + 56736.

It is an arithmetic number, because the mean of its divisors is an integer number (3137616).

Almost surely, 2^90215090 is an apocalyptic number.

90215090 is an abundant number, since it is smaller than the sum of its proper divisors (110592334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90215090 is a wasteful number, since it uses less digits than its factorization.

90215090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 90215090 is about 9498.1624538644. The cubic root of 90215090 is about 448.4971926147.

Adding to 90215090 its reverse (9051209), we get a palindrome (99266299).

The spelling of 90215090 in words is "ninety million, two hundred fifteen thousand, ninety".