691128936 has 48 divisors (see below), whose sum is σ = 1941139200. Its totient is φ = 230375664.

The previous prime is 691128917. The next prime is 691128983. The reversal of 691128936 is 639821196.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 691128891 and 691128900.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 175816 + ... + 179703.

It is an arithmetic number, because the mean of its divisors is an integer number (40440400).

Almost surely, 2^691128936 is an apocalyptic number.

It is an amenable number.

691128936 is an abundant number, since it is smaller than the sum of its proper divisors (1250010264).

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

691128936 is a wasteful number, since it uses less digits than its factorization.

691128936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355540 (or 355524 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 691128936 is about 26289.3312200976. The cubic root of 691128936 is about 884.1372574761.

The spelling of 691128936 in words is "six hundred ninety-one million, one hundred twenty-eight thousand, nine hundred thirty-six".