690984 has 64 divisors (see below), whose sum is σ = 2198400. Its totient is φ = 196992.

The previous prime is 690953. The next prime is 690997. The reversal of 690984 is 489096.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

690984 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 15 ways as a sum of consecutive naturals, for example, 1284 + ... + 1740.

It is an arithmetic number, because the mean of its divisors is an integer number (34350).

2⁶⁹⁰⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1099200).

690984 is an abundant number, since it is smaller than the sum of its proper divisors (1507416).

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

690984 is a wasteful number, since it uses less digits than its factorization.

690984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 690984 is about 831.2544736722. The cubic root of 690984 is about 88.4075449291.

The spelling of 690984 in words is "six hundred ninety thousand, nine hundred eighty-four".