690656 has 24 divisors (see below), whose sum is σ = 1378944. Its totient is φ = 340480.

The previous prime is 690629. The next prime is 690661. The reversal of 690656 is 656096.

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 3521 + ... + 3711.

It is an arithmetic number, because the mean of its divisors is an integer number (57456).

2⁶⁹⁰⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

690656 is a deficient number, since it is larger than the sum of its proper divisors (688288).

690656 is a wasteful number, since it uses less digits than its factorization.

690656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 690656 is about 831.0571580824. The cubic root of 690656 is about 88.3935541255.

The spelling of 690656 in words is "six hundred ninety thousand, six hundred fifty-six".