687230388 has 72 divisors (see below), whose sum is σ = 1882080200. Its totient is φ = 211431168.

The previous prime is 687230387. The next prime is 687230417. The reversal of 687230388 is 883032786.

It can be written as a sum of positive squares in 4 ways, for example, as 82955664 + 604274724 = 9108^2 + 24582^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687230387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74748 + ... + 83436.

Almost surely, 2^687230388 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 687230388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (941040100).

687230388 is an abundant number, since it is smaller than the sum of its proper divisors (1194849812).

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

687230388 is a wasteful number, since it uses less digits than its factorization.

687230388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8738 (or 8707 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 687230388 is about 26215.0794009860. The cubic root of 687230388 is about 882.4716961072.

The spelling of 687230388 in words is "six hundred eighty-seven million, two hundred thirty thousand, three hundred eighty-eight".