961999128 has 48 divisors (see below), whose sum is σ = 2758677480. Its totient is φ = 301803264.

The previous prime is 961999121. The next prime is 961999141. The reversal of 961999128 is 821999169.

961999128 is a `hidden beast` number, since 9 + 619 + 9 + 9 + 12 + 8 = 666.

961999128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961999121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 391750 + ... + 394197.

Almost surely, 2^961999128 is an apocalyptic number.

It is an amenable number.

961999128 is an abundant number, since it is smaller than the sum of its proper divisors (1796678352).

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

961999128 is a wasteful number, since it uses less digits than its factorization.

961999128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785976 (or 785969 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 961999128 is about 31016.1107813343. The cubic root of 961999128 is about 987.1691151846.

The spelling of 961999128 in words is "nine hundred sixty-one million, nine hundred ninety-nine thousand, one hundred twenty-eight".