90479879 has 4 divisors (see below), whose sum is σ = 103405584. Its totient is φ = 77554176.

The previous prime is 90479867. The next prime is 90479887. The reversal of 90479879 is 97897409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97897409 = 1061 ⋅92269.

It is a de Polignac number, because none of the positive numbers 2^k-90479879 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90479879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90479819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6462842 + ... + 6462855.

It is an arithmetic number, because the mean of its divisors is an integer number (25851396).

Almost surely, 2^90479879 is an apocalyptic number.

90479879 is a deficient number, since it is larger than the sum of its proper divisors (12925705).

90479879 is a wasteful number, since it uses less digits than its factorization.

90479879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12925704.

The product of its (nonzero) digits is 1143072, while the sum is 53.

The square root of 90479879 is about 9512.0912001515. The cubic root of 90479879 is about 448.9355565469.

The spelling of 90479879 in words is "ninety million, four hundred seventy-nine thousand, eight hundred seventy-nine".