689655264 has 192 divisors, whose sum is σ = 1979873280. Its totient is φ = 209664000.

The previous prime is 689655257. The next prime is 689655271. The reversal of 689655264 is 462556986.

It is an interprime number because it is at equal distance from previous prime (689655257) and next prime (689655271).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5264479 + ... + 5264609.

It is an arithmetic number, because the mean of its divisors is an integer number (10311840).

Almost surely, 2^689655264 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 689655264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (989936640).

689655264 is an abundant number, since it is smaller than the sum of its proper divisors (1290218016).

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

689655264 is a wasteful number, since it uses less digits than its factorization.

689655264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 257 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 51.

The square root of 689655264 is about 26261.2883156939. The cubic root of 689655264 is about 883.5084044912.

The spelling of 689655264 in words is "six hundred eighty-nine million, six hundred fifty-five thousand, two hundred sixty-four".