90842879 has 4 divisors (see below), whose sum is σ = 92087376. Its totient is φ = 89598384.

The previous prime is 90842863. The next prime is 90842891. The reversal of 90842879 is 97824809.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90842879 - 2⁴ = 90842863 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 (90842579) 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 3 ways as a sum of consecutive naturals, for example, 622139 + ... + 622284.

It is an arithmetic number, because the mean of its divisors is an integer number (23021844).

Almost surely, 2^90842879 is an apocalyptic number.

90842879 is a deficient number, since it is larger than the sum of its proper divisors (1244497).

90842879 is a wasteful number, since it uses less digits than its factorization.

90842879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244496.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 90842879 is about 9531.1530781957. The cubic root of 90842879 is about 449.5351232122.

The spelling of 90842879 in words is "ninety million, eight hundred forty-two thousand, eight hundred seventy-nine".