690628 has 6 divisors (see below), whose sum is σ = 1208606. Its totient is φ = 345312.

The previous prime is 690611. The next prime is 690629. The reversal of 690628 is 826096.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 53824 = 798^2 + 232^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 690628.

It is not an unprimeable number, because it can be changed into a prime (690629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86325 + ... + 86332.

2⁶⁹⁰⁶²⁸ is an apocalyptic number.

It is an amenable number.

690628 is a deficient number, since it is larger than the sum of its proper divisors (517978).

690628 is a wasteful number, since it uses less digits than its factorization.

690628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172661 (or 172659 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 690628 is about 831.0403118983. The cubic root of 690628 is about 88.3923595834.

The spelling of 690628 in words is "six hundred ninety thousand, six hundred twenty-eight".