90402378881 has 4 divisors (see below), whose sum is σ = 95720165892. Its totient is φ = 85084591872.

The previous prime is 90402378863. The next prime is 90402378883. The reversal of 90402378881 is 18887320409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18887320409 = 167 ⋅113097727.

It can be written as a sum of positive squares in 2 ways, for example, as 26696618881 + 63705760000 = 163391^2 + 252400^2 .

It is a cyclic number.

It is not a de Polignac number, because 90402378881 - 2⁶ = 90402378817 is a prime.

It is a super-2 number, since 2×90402378881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90402378883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2658893480 + ... + 2658893513.

It is an arithmetic number, because the mean of its divisors is an integer number (23930041473).

Almost surely, 2^90402378881 is an apocalyptic number.

It is an amenable number.

90402378881 is a deficient number, since it is larger than the sum of its proper divisors (5317787011).

90402378881 is a wasteful number, since it uses less digits than its factorization.

90402378881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317787010.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 90402378881 in words is "ninety billion, four hundred two million, three hundred seventy-eight thousand, eight hundred eighty-one".