691784396 has 12 divisors (see below), whose sum is σ = 1210807248. Its totient is φ = 345839472.

The previous prime is 691784371. The next prime is 691784411. The reversal of 691784396 is 693487196.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42065 + ... + 56151.

It is an arithmetic number, because the mean of its divisors is an integer number (100900604).

Almost surely, 2^691784396 is an apocalyptic number.

It is an amenable number.

691784396 is a deficient number, since it is larger than the sum of its proper divisors (519022852).

691784396 is a wasteful number, since it uses less digits than its factorization.

691784396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26368 (or 26366 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 53.

The square root of 691784396 is about 26301.7945395367. The cubic root of 691784396 is about 884.4166715721.

The spelling of 691784396 in words is "six hundred ninety-one million, seven hundred eighty-four thousand, three hundred ninety-six".