690988 has 12 divisors (see below), whose sum is σ = 1216152. Its totient is φ = 343520.

The previous prime is 690953. The next prime is 690997. The reversal of 690988 is 889096.

It is a happy number.

It is a super-2 number, since 2×690988² = 954928832288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 690988.

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, 528 + ... + 1288.

It is an arithmetic number, because the mean of its divisors is an integer number (101346).

2⁶⁹⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

690988 is a deficient number, since it is larger than the sum of its proper divisors (525164).

690988 is a wasteful number, since it uses less digits than its factorization.

690988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 690988 is about 831.2568796708. The cubic root of 690988 is about 88.4077155213.

The spelling of 690988 in words is "six hundred ninety thousand, nine hundred eighty-eight".