90684928450 has 12 divisors (see below), whose sum is σ = 168673967010. Its totient is φ = 36273971360.

The previous prime is 90684928441. The next prime is 90684928493. The reversal of 90684928450 is 5482948609.

It can be written as a sum of positive squares in 3 ways, for example, as 65314491489 + 25370436961 = 255567^2 + 159281^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90684928391 and 90684928400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 906849235 + ... + 906849334.

Almost surely, 2^90684928450 is an apocalyptic number.

90684928450 is a deficient number, since it is larger than the sum of its proper divisors (77989038560).

90684928450 is a wasteful number, since it uses less digits than its factorization.

90684928450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813698581 (or 1813698576 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 90684928450 in words is "ninety billion, six hundred eighty-four million, nine hundred twenty-eight thousand, four hundred fifty".