90499999 has 4 divisors (see below), whose sum is σ = 90564760. Its totient is φ = 90435240.

The previous prime is 90499987. The next prime is 90500063. The reversal of 90499999 is 99999409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99999409 = 47 ⋅2127647.

It is a cyclic number.

It is not a de Polignac number, because 90499999 - 2²³ = 82111391 is a prime.

It is a Duffinian number.

90499999 is a modest number, since divided by 9999 gives 9049 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90499099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30237 + ... + 33094.

It is an arithmetic number, because the mean of its divisors is an integer number (22641190).

Almost surely, 2^90499999 is an apocalyptic number.

90499999 is a deficient number, since it is larger than the sum of its proper divisors (64761).

90499999 is a wasteful number, since it uses less digits than its factorization.

90499999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64760.

The product of its (nonzero) digits is 2125764, while the sum is 58.

The square root of 90499999 is about 9513.1487426614. The cubic root of 90499999 is about 448.9688306628.

The spelling of 90499999 in words is "ninety million, four hundred ninety-nine thousand, nine hundred ninety-nine".