890995638 has 64 divisors (see below), whose sum is σ = 1968261120. Its totient is φ = 267176832.

The previous prime is 890995607. The next prime is 890995663. The reversal of 890995638 is 836599098.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 1315756 + ... + 1316432.

It is an arithmetic number, because the mean of its divisors is an integer number (30754080).

Almost surely, 2^890995638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 890995638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984130560).

890995638 is an abundant number, since it is smaller than the sum of its proper divisors (1077265482).

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

890995638 is a wasteful number, since it uses less digits than its factorization.

890995638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The square root of 890995638 is about 29849.5500468600. The cubic root of 890995638 is about 962.2587287083.

The spelling of 890995638 in words is "eight hundred ninety million, nine hundred ninety-five thousand, six hundred thirty-eight".