8990737581 has 32 divisors (see below), whose sum is σ = 13755025408. Its totient is φ = 5117048640.

The previous prime is 8990737577. The next prime is 8990737631. The reversal of 8990737581 is 1857370998.

It is not a de Polignac number, because 8990737581 - 2² = 8990737577 is a prime.

It is a super-2 number, since 2×8990737581² (a number of 21 digits) contains 22 as substring.

It is the 94820-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8990737531) by changing a digit.

It is a nontrivial repunit in base 94819.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10923936 + ... + 10924758.

It is an arithmetic number, because the mean of its divisors is an integer number (429844544).

Almost surely, 2^8990737581 is an apocalyptic number.

It is an amenable number.

8990737581 is a deficient number, since it is larger than the sum of its proper divisors (4764287827).

8990737581 is a wasteful number, since it uses less digits than its factorization.

8990737581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2281.

The product of its (nonzero) digits is 3810240, while the sum is 57.

The square root of 8990737581 is about 94819.5000039549. The cubic root of 8990737581 is about 2079.3700000458.

The spelling of 8990737581 in words is "eight billion, nine hundred ninety million, seven hundred thirty-seven thousand, five hundred eighty-one".