90195879 has 4 divisors (see below), whose sum is σ = 120261176. Its totient is φ = 60130584.

The previous prime is 90195871. The next prime is 90195883. The reversal of 90195879 is 97859109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97859109 = 3 ⋅32619703.

It is not a de Polignac number, because 90195879 - 2³ = 90195871 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 (90195871) 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, 15032644 + ... + 15032649.

It is an arithmetic number, because the mean of its divisors is an integer number (30065294).

Almost surely, 2^90195879 is an apocalyptic number.

90195879 is a deficient number, since it is larger than the sum of its proper divisors (30065297).

90195879 is a wasteful number, since it uses less digits than its factorization.

90195879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30065296.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 90195879 is about 9497.1510991455. The cubic root of 90195879 is about 448.4653550318.

The spelling of 90195879 in words is "ninety million, one hundred ninety-five thousand, eight hundred seventy-nine".