90408090 has 32 divisors (see below), whose sum is σ = 223981056. Its totient is φ = 23330880.

The previous prime is 90408077. The next prime is 90408103. The reversal of 90408090 is 9080409.

It is an interprime number because it is at equal distance from previous prime (90408077) and next prime (90408103).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47677 + ... + 49536.

It is an arithmetic number, because the mean of its divisors is an integer number (6999408).

Almost surely, 2^90408090 is an apocalyptic number.

90408090 is an abundant number, since it is smaller than the sum of its proper divisors (133572966).

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

90408090 is a wasteful number, since it uses less digits than its factorization.

90408090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97254.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 90408090 is about 9508.3168857585. The cubic root of 90408090 is about 448.8167928967.

Adding to 90408090 its reverse (9080409), we get a palindrome (99488499).

The spelling of 90408090 in words is "ninety million, four hundred eight thousand, ninety".