90499890 has 32 divisors (see below), whose sum is σ = 233908416. Its totient is φ = 22276800.

The previous prime is 90499889. The next prime is 90499921. The reversal of 90499890 is 9899409.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115636 + ... + 116415.

It is an arithmetic number, because the mean of its divisors is an integer number (7309638).

Almost surely, 2^90499890 is an apocalyptic number.

90499890 is an abundant number, since it is smaller than the sum of its proper divisors (143408526).

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

90499890 is a wasteful number, since it uses less digits than its factorization.

90499890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232074.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 90499890 is about 9513.1430137468. The cubic root of 90499890 is about 448.9686504138.

The spelling of 90499890 in words is "ninety million, four hundred ninety-nine thousand, eight hundred ninety".