691543928 has 16 divisors (see below), whose sum is σ = 1298671080. Its totient is φ = 345231648.

The previous prime is 691543913. The next prime is 691543933. The reversal of 691543928 is 829345196.

691543928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 62075 + ... + 72362.

Almost surely, 2^691543928 is an apocalyptic number.

It is an amenable number.

691543928 is a deficient number, since it is larger than the sum of its proper divisors (607127152).

691543928 is a wasteful number, since it uses less digits than its factorization.

691543928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135086 (or 135082 counting only the distinct ones).

The product of its digits is 466560, while the sum is 47.

The square root of 691543928 is about 26297.2228191496. Note that the first 3 decimals coincide. The cubic root of 691543928 is about 884.3141836889.

The spelling of 691543928 in words is "six hundred ninety-one million, five hundred forty-three thousand, nine hundred twenty-eight".