691504 has 20 divisors (see below), whose sum is σ = 1461960. Its totient is φ = 314240.

The previous prime is 691499. The next prime is 691531. The reversal of 691504 is 405196.

It is an unprimeable number.

691504 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789 + ... + 2140.

It is an arithmetic number, because the mean of its divisors is an integer number (73098).

2⁶⁹¹⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

691504 is an abundant number, since it is smaller than the sum of its proper divisors (770456).

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

691504 is a wasteful number, since it uses less digits than its factorization.

691504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948 (or 3942 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 691504 is about 831.5671951202. The cubic root of 691504 is about 88.4297164005.

The spelling of 691504 in words is "six hundred ninety-one thousand, five hundred four".