90930978 has 64 divisors (see below), whose sum is σ = 210781440. Its totient is φ = 29030400.

The previous prime is 90930953. The next prime is 90930991. The reversal of 90930978 is 87903909.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141538 + ... + 142178.

It is an arithmetic number, because the mean of its divisors is an integer number (3293460).

Almost surely, 2^90930978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90930978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105390720).

90930978 is an abundant number, since it is smaller than the sum of its proper divisors (119850462).

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

90930978 is a wasteful number, since it uses less digits than its factorization.

90930978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 754 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 90930978 is about 9535.7735921109. The cubic root of 90930978 is about 449.6803952822.

The spelling of 90930978 in words is "ninety million, nine hundred thirty thousand, nine hundred seventy-eight".