90099780 has 24 divisors (see below), whose sum is σ = 252279552. Its totient is φ = 24026592.

The previous prime is 90099731. The next prime is 90099817. The reversal of 90099780 is 8799009.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750772 + ... + 750891.

It is an arithmetic number, because the mean of its divisors is an integer number (10511648).

Almost surely, 2^90099780 is an apocalyptic number.

It is an amenable number.

90099780 is an abundant number, since it is smaller than the sum of its proper divisors (162179772).

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

90099780 is a wasteful number, since it uses less digits than its factorization.

90099780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501675 (or 1501673 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 90099780 is about 9492.0903914786. The cubic root of 90099780 is about 448.3060262923.

The spelling of 90099780 in words is "ninety million, ninety-nine thousand, seven hundred eighty".