90838979 has 16 divisors (see below), whose sum is σ = 115395840. Its totient is φ = 69444960.

The previous prime is 90838967. The next prime is 90838999. The reversal of 90838979 is 97983809.

It is a cyclic number.

It is not a de Polignac number, because 90838979 - 2⁸ = 90838723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 90838979.

It is not an unprimeable number, because it can be changed into a prime (90838999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7049 + ... + 15210.

It is an arithmetic number, because the mean of its divisors is an integer number (7212240).

Almost surely, 2^90838979 is an apocalyptic number.

90838979 is a deficient number, since it is larger than the sum of its proper divisors (24556861).

90838979 is a wasteful number, since it uses less digits than its factorization.

90838979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22330.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 90838979 is about 9530.9484837554. The cubic root of 90838979 is about 449.5286900825.

The spelling of 90838979 in words is "ninety million, eight hundred thirty-eight thousand, nine hundred seventy-nine".