90808989 has 8 divisors (see below), whose sum is σ = 124351200. Its totient is φ = 58903056.

The previous prime is 90808987. The next prime is 90809003. The reversal of 90808989 is 98980809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90808989 - 2¹ = 90808987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90808987) 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, 408939 + ... + 409160.

It is an arithmetic number, because the mean of its divisors is an integer number (15543900).

Almost surely, 2^90808989 is an apocalyptic number.

It is an amenable number.

90808989 is a deficient number, since it is larger than the sum of its proper divisors (33542211).

90808989 is a wasteful number, since it uses less digits than its factorization.

90808989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818139.

The product of its (nonzero) digits is 373248, while the sum is 51.

The square root of 90808989 is about 9529.3750582082. The cubic root of 90808989 is about 449.4792148115.

The spelling of 90808989 in words is "ninety million, eight hundred eight thousand, nine hundred eighty-nine".