90978804 has 72 divisors (see below), whose sum is σ = 264700800. Its totient is φ = 25808832.

The previous prime is 90978787. The next prime is 90978827. The reversal of 90978804 is 40887909.

It is a self number, because there is not a number n which added to its sum of digits gives 90978804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36337 + ... + 38759.

It is an arithmetic number, because the mean of its divisors is an integer number (3676400).

Almost surely, 2^90978804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90978804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132350400).

90978804 is an abundant number, since it is smaller than the sum of its proper divisors (173721996).

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

90978804 is a wasteful number, since it uses less digits than its factorization.

90978804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589 (or 2584 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 90978804 is about 9538.2809771992. The cubic root of 90978804 is about 449.7592193371.

The spelling of 90978804 in words is "ninety million, nine hundred seventy-eight thousand, eight hundred four".