691364628 has 36 divisors (see below), whose sum is σ = 1839597760. Its totient is φ = 218325456.

The previous prime is 691364603. The next prime is 691364651. The reversal of 691364628 is 826463196.

691364628 is a `hidden beast` number, since 6 + 9 + 13 + 6 + 4 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 504700 + ... + 506067.

Almost surely, 2^691364628 is an apocalyptic number.

It is an amenable number.

691364628 is an abundant number, since it is smaller than the sum of its proper divisors (1148233132).

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

691364628 is a wasteful number, since it uses less digits than its factorization.

691364628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010796 (or 1010791 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 691364628 is about 26293.8134929112. The cubic root of 691364628 is about 884.2377502516.

The spelling of 691364628 in words is "six hundred ninety-one million, three hundred sixty-four thousand, six hundred twenty-eight".