691724044 has 24 divisors (see below), whose sum is σ = 1324044288. Its totient is φ = 313591440.

The previous prime is 691724039. The next prime is 691724087. The reversal of 691724044 is 440427196.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 691723994 and 691724012.

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, 3672 + ... + 37375.

It is an arithmetic number, because the mean of its divisors is an integer number (55168512).

Almost surely, 2^691724044 is an apocalyptic number.

It is an amenable number.

691724044 is a deficient number, since it is larger than the sum of its proper divisors (632320244).

691724044 is a wasteful number, since it uses less digits than its factorization.

691724044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41445 (or 41443 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 691724044 is about 26300.6472163709. The cubic root of 691724044 is about 884.3909516765.

The spelling of 691724044 in words is "six hundred ninety-one million, seven hundred twenty-four thousand, forty-four".