90724939189 has 4 divisors (see below), whose sum is σ = 90732063724. Its totient is φ = 90717814656.

The previous prime is 90724939177. The next prime is 90724939211. The reversal of 90724939189 is 98193942709.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70096798564 + 20628140625 = 264758^2 + 143625^2 .

It is a cyclic number.

It is not a de Polignac number, because 90724939189 - 2⁵ = 90724939157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90724939169) 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, 3543132 + ... + 3568645.

It is an arithmetic number, because the mean of its divisors is an integer number (22683015931).

Almost surely, 2^90724939189 is an apocalyptic number.

It is an amenable number.

90724939189 is a deficient number, since it is larger than the sum of its proper divisors (7124535).

90724939189 is a wasteful number, since it uses less digits than its factorization.

90724939189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7124534.

The product of its (nonzero) digits is 8817984, while the sum is 61.

The spelling of 90724939189 in words is "ninety billion, seven hundred twenty-four million, nine hundred thirty-nine thousand, one hundred eighty-nine".