691640496 has 30 divisors (see below), whose sum is σ = 1935633180. Its totient is φ = 230546784.

The previous prime is 691640491. The next prime is 691640507. The reversal of 691640496 is 694046196.

It is not an unprimeable number, because it can be changed into a prime (691640491) 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 5 ways as a sum of consecutive naturals, for example, 2401386 + ... + 2401673.

It is an arithmetic number, because the mean of its divisors is an integer number (64521106).

Almost surely, 2^691640496 is an apocalyptic number.

It is an amenable number.

691640496 is an abundant number, since it is smaller than the sum of its proper divisors (1243992684).

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

691640496 is a wasteful number, since it uses less digits than its factorization.

691640496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4803073 (or 4803064 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 691640496 is about 26299.0588424757. The cubic root of 691640496 is about 884.3553439941.

The spelling of 691640496 in words is "six hundred ninety-one million, six hundred forty thousand, four hundred ninety-six".