691428572 has 12 divisors (see below), whose sum is σ = 1210986840. Its totient is φ = 345432336.

The previous prime is 691428541. The next prime is 691428589. The reversal of 691428572 is 275824196.

It is a happy number.

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, 64922 + ... + 74817.

It is an arithmetic number, because the mean of its divisors is an integer number (100915570).

Almost surely, 2^691428572 is an apocalyptic number.

It is an amenable number.

691428572 is a deficient number, since it is larger than the sum of its proper divisors (519558268).

691428572 is a wasteful number, since it uses less digits than its factorization.

691428572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140980 (or 140978 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The square root of 691428572 is about 26295.0294162224. The cubic root of 691428572 is about 884.2650103270.

The spelling of 691428572 in words is "six hundred ninety-one million, four hundred twenty-eight thousand, five hundred seventy-two".