90899720 has 16 divisors (see below), whose sum is σ = 204524460. Its totient is φ = 36359872.

The previous prime is 90899701. The next prime is 90899723. The reversal of 90899720 is 2799809.

It can be written as a sum of positive squares in 2 ways, for example, as 83137924 + 7761796 = 9118^2 + 2786^2 .

It is not an unprimeable number, because it can be changed into a prime (90899723) 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, 1136207 + ... + 1136286.

Almost surely, 2^90899720 is an apocalyptic number.

It is an amenable number.

90899720 is an abundant number, since it is smaller than the sum of its proper divisors (113624740).

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

90899720 is a wasteful number, since it uses less digits than its factorization.

90899720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2272504 (or 2272500 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 90899720 is about 9534.1344651730. The cubic root of 90899720 is about 449.6288627131.

It can be divided in two parts, 90899 and 720, that added together give a palindrome (91619).

The spelling of 90899720 in words is "ninety million, eight hundred ninety-nine thousand, seven hundred twenty".