89989090 has 16 divisors (see below), whose sum is σ = 162538488. Its totient is φ = 35871616.

The previous prime is 89989079. The next prime is 89989093. The reversal of 89989090 is 9098998.

It can be written as a sum of positive squares in 4 ways, for example, as 89813529 + 175561 = 9477^2 + 419^2 .

It is not an unprimeable number, because it can be changed into a prime (89989093) 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, 12427 + ... + 18286.

Almost surely, 2^89989090 is an apocalyptic number.

89989090 is a deficient number, since it is larger than the sum of its proper divisors (72549398).

89989090 is a wasteful number, since it uses less digits than its factorization.

89989090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31013.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 89989090 is about 9486.2579555903. The cubic root of 89989090 is about 448.1223657292.

The spelling of 89989090 in words is "eighty-nine million, nine hundred eighty-nine thousand, ninety".