691668470 has 16 divisors (see below), whose sum is σ = 1263586608. Its totient is φ = 272537760.

The previous prime is 691668449. The next prime is 691668493. The reversal of 691668470 is 74866196.

It is a happy number.

691668470 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 7 ways as a sum of consecutive naturals, for example, 515501 + ... + 516840.

It is an arithmetic number, because the mean of its divisors is an integer number (78974163).

Almost surely, 2^691668470 is an apocalyptic number.

691668470 is a deficient number, since it is larger than the sum of its proper divisors (571918138).

691668470 is a wasteful number, since it uses less digits than its factorization.

691668470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032415.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 691668470 is about 26299.5906812254. The cubic root of 691668470 is about 884.3672666731.

The spelling of 691668470 in words is "six hundred ninety-one million, six hundred sixty-eight thousand, four hundred seventy".