691378774 has 8 divisors (see below), whose sum is σ = 1044028800. Its totient is φ = 343369176.

The previous prime is 691378703. The next prime is 691378801. The reversal of 691378774 is 477873196.

691378774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1159734 + ... + 1160329.

It is an arithmetic number, because the mean of its divisors is an integer number (130503600).

Almost surely, 2^691378774 is an apocalyptic number.

691378774 is a deficient number, since it is larger than the sum of its proper divisors (352650026).

691378774 is a wasteful number, since it uses less digits than its factorization.

691378774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320214.

The product of its digits is 1778112, while the sum is 52.

The square root of 691378774 is about 26294.0824901726. The cubic root of 691378774 is about 884.2437810017.

The spelling of 691378774 in words is "six hundred ninety-one million, three hundred seventy-eight thousand, seven hundred seventy-four".