90099992 has 32 divisors (see below), whose sum is σ = 173171520. Its totient is φ = 43934880.

The previous prime is 90099991. The next prime is 90100009. The reversal of 90099992 is 29999009.

It is a happy number.

It is a super-3 number, since 3×90099992³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90099991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56567 + ... + 58137.

It is an arithmetic number, because the mean of its divisors is an integer number (5411610).

Almost surely, 2^90099992 is an apocalyptic number.

It is an amenable number.

90099992 is a deficient number, since it is larger than the sum of its proper divisors (83071528).

90099992 is a wasteful number, since it uses less digits than its factorization.

90099992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1747 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 90099992 is about 9492.1015586644. The cubic root of 90099992 is about 448.3063779055.

The spelling of 90099992 in words is "ninety million, ninety-nine thousand, nine hundred ninety-two".