90099550 has 24 divisors (see below), whose sum is σ = 171676512. Its totient is φ = 35160000.

The previous prime is 90099521. The next prime is 90099563. The reversal of 90099550 is 5599009.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19926 + ... + 24025.

It is an arithmetic number, because the mean of its divisors is an integer number (7153188).

Almost surely, 2^90099550 is an apocalyptic number.

90099550 is a deficient number, since it is larger than the sum of its proper divisors (81576962).

90099550 is a wasteful number, since it uses less digits than its factorization.

90099550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44004 (or 43999 counting only the distinct ones).

The product of its (nonzero) digits is 18225, while the sum is 37.

The square root of 90099550 is about 9492.0782761206. The cubic root of 90099550 is about 448.3056448246.

The spelling of 90099550 in words is "ninety million, ninety-nine thousand, five hundred fifty".