991765792 has 24 divisors (see below), whose sum is σ = 1953504000. Its totient is φ = 495637824.

The previous prime is 991765787. The next prime is 991765799. The reversal of 991765792 is 297567199.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (991765799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70309 + ... + 83227.

It is an arithmetic number, because the mean of its divisors is an integer number (81396000).

Almost surely, 2^991765792 is an apocalyptic number.

It is an amenable number.

991765792 is a deficient number, since it is larger than the sum of its proper divisors (961738208).

991765792 is a wasteful number, since it uses less digits than its factorization.

991765792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15328 (or 15320 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 55.

The square root of 991765792 is about 31492.3132208480. The cubic root of 991765792 is about 997.2476957712.

The spelling of 991765792 in words is "nine hundred ninety-one million, seven hundred sixty-five thousand, seven hundred ninety-two".