689355784 has 16 divisors (see below), whose sum is σ = 1391968620. Its totient is φ = 318164160.

The previous prime is 689355767. The next prime is 689355787. The reversal of 689355784 is 487553986.

It can be written as a sum of positive squares in 2 ways, for example, as 672364900 + 16990884 = 25930^2 + 4122^2 .

It is a super-2 number, since 2×689355784² = 950422793868509312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (689355787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3314107 + ... + 3314314.

Almost surely, 2^689355784 is an apocalyptic number.

It is an amenable number.

689355784 is an abundant number, since it is smaller than the sum of its proper divisors (702612836).

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

689355784 is a wasteful number, since it uses less digits than its factorization.

689355784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628440 (or 6628436 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 55.

The square root of 689355784 is about 26255.5857676038. The cubic root of 689355784 is about 883.3804993287.

The spelling of 689355784 in words is "six hundred eighty-nine million, three hundred fifty-five thousand, seven hundred eighty-four".