90091290 has 16 divisors (see below), whose sum is σ = 216219168. Its totient is φ = 24024336.

The previous prime is 90091283. The next prime is 90091291. The reversal of 90091290 is 9219009.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 3003043 = 90091290 / (9 + 0 + 0 + 9 + 1 + 2 + 9 + 0).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90091291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1501492 + ... + 1501551.

It is an arithmetic number, because the mean of its divisors is an integer number (13513698).

Almost surely, 2^90091290 is an apocalyptic number.

90091290 is an abundant number, since it is smaller than the sum of its proper divisors (126127878).

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

90091290 is a wasteful number, since it uses less digits than its factorization.

90091290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003053.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 90091290 is about 9491.6431664912. The cubic root of 90091290 is about 448.2919447274.

The spelling of 90091290 in words is "ninety million, ninety-one thousand, two hundred ninety".