90019880 has 32 divisors (see below), whose sum is σ = 204641640. Its totient is φ = 35635200.

The previous prime is 90019859. The next prime is 90019889. The reversal of 90019880 is 8891009.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 85414564 + 4605316 = 9242^2 + 2146^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 90019880.

It is not an unprimeable number, because it can be changed into a prime (90019889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7721 + ... + 15480.

Almost surely, 2^90019880 is an apocalyptic number.

It is an amenable number.

90019880 is an abundant number, since it is smaller than the sum of its proper divisors (114621760).

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

90019880 is a wasteful number, since it uses less digits than its factorization.

90019880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23309 (or 23305 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 90019880 is about 9487.8806906495. The cubic root of 90019880 is about 448.1734686437.

It can be divided in two parts, 9001 and 9880, that added together give a palindrome (18881).

The spelling of 90019880 in words is "ninety million, nineteen thousand, eight hundred eighty".