90979819 has 12 divisors (see below), whose sum is σ = 106231584. Its totient is φ = 77689584.

The previous prime is 90979817. The next prime is 90979841. The reversal of 90979819 is 91897909.

It is not a de Polignac number, because 90979819 - 2¹ = 90979817 is a prime.

It is a super-2 number, since 2×90979819² = 16554654930545522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90979813) 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 11 ways as a sum of consecutive naturals, for example, 10222 + ... + 16924.

It is an arithmetic number, because the mean of its divisors is an integer number (8852632).

Almost surely, 2^90979819 is an apocalyptic number.

90979819 is a deficient number, since it is larger than the sum of its proper divisors (15251765).

90979819 is a wasteful number, since it uses less digits than its factorization.

90979819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994 (or 6987 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 90979819 is about 9538.3341837031. The cubic root of 90979819 is about 449.7608919021.

The spelling of 90979819 in words is "ninety million, nine hundred seventy-nine thousand, eight hundred nineteen".