988644390 has 64 divisors (see below), whose sum is σ = 2434240512. Its totient is φ = 256838400.

The previous prime is 988644379. The next prime is 988644421. The reversal of 988644390 is 93446889.

It is a happy number.

988644390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 671355 + ... + 672825.

It is an arithmetic number, because the mean of its divisors is an integer number (38035008).

Almost surely, 2^988644390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 988644390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1217120256).

988644390 is an abundant number, since it is smaller than the sum of its proper divisors (1445596122).

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

988644390 is a wasteful number, since it uses less digits than its factorization.

988644390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 988644390 is about 31442.7160086402. The cubic root of 988644390 is about 996.2003778232.

The spelling of 988644390 in words is "nine hundred eighty-eight million, six hundred forty-four thousand, three hundred ninety".