90909087 has 8 divisors (see below), whose sum is σ = 126482304. Its totient is φ = 57970968.

The previous prime is 90909073. The next prime is 90909089. The reversal of 90909087 is 78090909.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90909087 - 2⁷ = 90908959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90909089) 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, 658693 + ... + 658830.

It is an arithmetic number, because the mean of its divisors is an integer number (15810288).

Almost surely, 2^90909087 is an apocalyptic number.

90909087 is a deficient number, since it is larger than the sum of its proper divisors (35573217).

90909087 is a wasteful number, since it uses less digits than its factorization.

90909087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317549.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 90909087 is about 9534.6256874615. The cubic root of 90909087 is about 449.6443065777.

The spelling of 90909087 in words is "ninety million, nine hundred nine thousand, eighty-seven".