90918192720 has 80 divisors (see below), whose sum is σ = 282052697472. Its totient is φ = 24227105280.

The previous prime is 90918192709. The next prime is 90918192749. The reversal of 90918192720 is 2729181909.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×90918192720² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 90918192720.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191565 + ... + 467475.

Almost surely, 2^90918192720 is an apocalyptic number.

It is an amenable number.

90918192720 is an abundant number, since it is smaller than the sum of its proper divisors (191134504752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90918192720 is a wasteful number, since it uses less digits than its factorization.

90918192720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277300 (or 277294 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 48.

The spelling of 90918192720 in words is "ninety billion, nine hundred eighteen million, one hundred ninety-two thousand, seven hundred twenty".