961138928 has 80 divisors (see below), whose sum is σ = 2018602944. Its totient is φ = 441692160.

The previous prime is 961138903. The next prime is 961138943. The reversal of 961138928 is 829831169.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3031826 + ... + 3032142.

Almost surely, 2^961138928 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 961138928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1009301472).

961138928 is an abundant number, since it is smaller than the sum of its proper divisors (1057464016).

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

961138928 is a wasteful number, since it uses less digits than its factorization.

961138928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 564 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 961138928 is about 31002.2406932144. The cubic root of 961138928 is about 986.8747919448.

The spelling of 961138928 in words is "nine hundred sixty-one million, one hundred thirty-eight thousand, nine hundred twenty-eight".