688469704 has 32 divisors (see below), whose sum is σ = 1424094840. Its totient is φ = 310003200.

The previous prime is 688469701. The next prime is 688469707. The reversal of 688469704 is 407964886.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (688469701) and next prime (688469707).

It can be written as a sum of positive squares in 4 ways, for example, as 191268900 + 497200804 = 13830^2 + 22298^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (688469701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76467 + ... + 84994.

Almost surely, 2^688469704 is an apocalyptic number.

It is an amenable number.

688469704 is an abundant number, since it is smaller than the sum of its proper divisors (735625136).

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

688469704 is a wasteful number, since it uses less digits than its factorization.

688469704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161521 (or 161517 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 688469704 is about 26238.7062181046. The cubic root of 688469704 is about 883.0018456038.

The spelling of 688469704 in words is "six hundred eighty-eight million, four hundred sixty-nine thousand, seven hundred four".