90259559879 has 4 divisors (see below), whose sum is σ = 90260245920. Its totient is φ = 90258873840.

The previous prime is 90259559843. The next prime is 90259559881. The reversal of 90259559879 is 97895595209.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 97895595209 = 6967 ⋅14051327.

It is a cyclic number.

It is not a de Polignac number, because 90259559879 - 2⁸ = 90259559623 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 (90259519879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76799 + ... + 431760.

It is an arithmetic number, because the mean of its divisors is an integer number (22565061480).

Almost surely, 2^90259559879 is an apocalyptic number.

90259559879 is a deficient number, since it is larger than the sum of its proper divisors (686041).

90259559879 is a wasteful number, since it uses less digits than its factorization.

90259559879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686040.

The product of its (nonzero) digits is 91854000, while the sum is 68.

The spelling of 90259559879 in words is "ninety billion, two hundred fifty-nine million, five hundred fifty-nine thousand, eight hundred seventy-nine".