90820879 has 2 divisors, whose sum is σ = 90820880. Its totient is φ = 90820878.

The previous prime is 90820867. The next prime is 90820901. The reversal of 90820879 is 97802809.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90820879 - 2²¹ = 88723727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90820679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45410439 + 45410440.

It is an arithmetic number, because the mean of its divisors is an integer number (45410440).

Almost surely, 2^90820879 is an apocalyptic number.

90820879 is a deficient number, since it is larger than the sum of its proper divisors (1).

90820879 is an equidigital number, since it uses as much as digits as its factorization.

90820879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 90820879 is about 9529.9988982161. The cubic root of 90820879 is about 449.4988313520.

The spelling of 90820879 in words is "ninety million, eight hundred twenty thousand, eight hundred seventy-nine".