90791620 has 12 divisors (see below), whose sum is σ = 190662444. Its totient is φ = 36316640.

The previous prime is 90791609. The next prime is 90791621. The reversal of 90791620 is 2619709.

It can be written as a sum of positive squares in 2 ways, for example, as 33547264 + 57244356 = 5792^2 + 7566^2 .

It is not an unprimeable number, because it can be changed into a prime (90791621) 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, 2269771 + ... + 2269810.

It is an arithmetic number, because the mean of its divisors is an integer number (15888537).

Almost surely, 2^90791620 is an apocalyptic number.

It is an amenable number.

90791620 is an abundant number, since it is smaller than the sum of its proper divisors (99870824).

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

90791620 is a wasteful number, since it uses less digits than its factorization.

90791620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539590 (or 4539588 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 90791620 is about 9528.4636746959. The cubic root of 90791620 is about 449.4505557461.

The spelling of 90791620 in words is "ninety million, seven hundred ninety-one thousand, six hundred twenty".