90970638 has 64 divisors (see below), whose sum is σ = 212751360. Its totient is φ = 25625600.

The previous prime is 90970619. The next prime is 90970673. The reversal of 90970638 is 83607909.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 90970638.

It is a congruent 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, 99403 + ... + 100313.

It is an arithmetic number, because the mean of its divisors is an integer number (3324240).

Almost surely, 2^90970638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90970638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106375680).

90970638 is an abundant number, since it is smaller than the sum of its proper divisors (121780722).

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

90970638 is a wasteful number, since it uses less digits than its factorization.

90970638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 90970638 is about 9537.8529030385. The cubic root of 90970638 is about 449.7457625628.

The spelling of 90970638 in words is "ninety million, nine hundred seventy thousand, six hundred thirty-eight".