991765960 has 16 divisors (see below), whose sum is σ = 2231473500. Its totient is φ = 396706368.

The previous prime is 991765949. The next prime is 991765961. The reversal of 991765960 is 69567199.

991765960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 991116324 + 649636 = 31482^2 + 806^2 .

It is a junction number, because it is equal to n+sod(n) for n = 991765898 and 991765907.

It is not an unprimeable number, because it can be changed into a prime (991765961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12397035 + ... + 12397114.

Almost surely, 2^991765960 is an apocalyptic number.

It is an amenable number.

991765960 is an abundant number, since it is smaller than the sum of its proper divisors (1239707540).

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

991765960 is a wasteful number, since it uses less digits than its factorization.

991765960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24794160 (or 24794156 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 52.

The square root of 991765960 is about 31492.3158881655. The cubic root of 991765960 is about 997.2477520807.

The spelling of 991765960 in words is "nine hundred ninety-one million, seven hundred sixty-five thousand, nine hundred sixty".