89919090 has 24 divisors (see below), whose sum is σ = 233789868. Its totient is φ = 23978400.

The previous prime is 89919079. The next prime is 89919101. The reversal of 89919090 is 9091998.

It is an interprime number because it is at equal distance from previous prime (89919079) and next prime (89919101).

It can be written as a sum of positive squares in 2 ways, for example, as 86881041 + 3038049 = 9321^2 + 1743^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 499461 + ... + 499640.

Almost surely, 2^89919090 is an apocalyptic number.

89919090 is an abundant number, since it is smaller than the sum of its proper divisors (143870778).

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

89919090 is a wasteful number, since it uses less digits than its factorization.

89919090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999114 (or 999111 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 89919090 is about 9482.5676902409. The cubic root of 89919090 is about 448.0061416303.

It can be divided in two parts, 8991 and 9090, that added together give a palindrome (18081).

The spelling of 89919090 in words is "eighty-nine million, nine hundred nineteen thousand, ninety".