690655 has 12 divisors (see below), whose sum is σ = 964440. Its totient is φ = 473424.

The previous prime is 690629. The next prime is 690661. The reversal of 690655 is 556096.

It is a happy number.

It is not a de Polignac number, because 690655 - 2⁹ = 690143 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1165 + ... + 1654.

It is an arithmetic number, because the mean of its divisors is an integer number (80370).

2⁶⁹⁰⁶⁵⁵ is an apocalyptic number.

690655 is a deficient number, since it is larger than the sum of its proper divisors (273785).

690655 is a wasteful number, since it uses less digits than its factorization.

690655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2838 (or 2831 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 690655 is about 831.0565564389. The cubic root of 690655 is about 88.3935114639.

The spelling of 690655 in words is "six hundred ninety thousand, six hundred fifty-five".