90507090 has 32 divisors (see below), whose sum is σ = 222518016. Its totient is φ = 23546240.

The previous prime is 90507083. The next prime is 90507091. The reversal of 90507090 is 9070509.

It is a happy number.

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

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 (90507091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35562 + ... + 38021.

It is an arithmetic number, because the mean of its divisors is an integer number (6953688).

Almost surely, 2^90507090 is an apocalyptic number.

90507090 is an abundant number, since it is smaller than the sum of its proper divisors (132010926).

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

90507090 is a wasteful number, since it uses less digits than its factorization.

90507090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73634.

The product of its (nonzero) digits is 2835, while the sum is 30.

The square root of 90507090 is about 9513.5214300489. The cubic root of 90507090 is about 448.9805564635.

Adding to 90507090 its reverse (9070509), we get a palindrome (99577599).

The spelling of 90507090 in words is "ninety million, five hundred seven thousand, ninety".