89999990 has 16 divisors (see below), whose sum is σ = 162108000. Its totient is φ = 35976000.

The previous prime is 89999983. The next prime is 89999999. The reversal of 89999990 is 9999998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89999999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28490 + ... + 31490.

It is an arithmetic number, because the mean of its divisors is an integer number (10131750).

Almost surely, 2^89999990 is an apocalyptic number.

89999990 is a deficient number, since it is larger than the sum of its proper divisors (72108010).

89999990 is a wasteful number, since it uses less digits than its factorization.

89999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6007.

The product of its (nonzero) digits is 4251528, while the sum is 62.

The square root of 89999990 is about 9486.8324534588. The cubic root of 89999990 is about 448.1404580579.

The spelling of 89999990 in words is "eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety".