90651779720 has 32 divisors (see below), whose sum is σ = 204403305600. Its totient is φ = 36183058368.

The previous prime is 90651779671. The next prime is 90651779741. The reversal of 90651779720 is 2797715609.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2407760 + ... + 2445119.

It is an arithmetic number, because the mean of its divisors is an integer number (6387603300).

Almost surely, 2^90651779720 is an apocalyptic number.

It is an amenable number.

90651779720 is an abundant number, since it is smaller than the sum of its proper divisors (113751525880).

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

90651779720 is a wasteful number, since it uses less digits than its factorization.

90651779720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4853357 (or 4853353 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 53.

The spelling of 90651779720 in words is "ninety billion, six hundred fifty-one million, seven hundred seventy-nine thousand, seven hundred twenty".