90815279 has 8 divisors (see below), whose sum is σ = 93397920. Its totient is φ = 88239456.

The previous prime is 90815243. The next prime is 90815299. The reversal of 90815279 is 97251809.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90815279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90815239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38177 + ... + 40485.

It is an arithmetic number, because the mean of its divisors is an integer number (11674740).

Almost surely, 2^90815279 is an apocalyptic number.

90815279 is a deficient number, since it is larger than the sum of its proper divisors (2582641).

90815279 is a wasteful number, since it uses less digits than its factorization.

90815279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3409.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 90815279 is about 9529.7050846288. The cubic root of 90815279 is about 449.4895924882.

The spelling of 90815279 in words is "ninety million, eight hundred fifteen thousand, two hundred seventy-nine".