687630280 has 32 divisors (see below), whose sum is σ = 1638179640. Its totient is φ = 258872320.

The previous prime is 687630277. The next prime is 687630283. The reversal of 687630280 is 82036786.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (687630277) and next prime (687630283).

It can be written as a sum of positive squares in 4 ways, for example, as 578594916 + 109035364 = 24054^2 + 10442^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (687630283) 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, 504931 + ... + 506290.

Almost surely, 2^687630280 is an apocalyptic number.

It is an amenable number.

687630280 is an abundant number, since it is smaller than the sum of its proper divisors (950549360).

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

687630280 is a wasteful number, since it uses less digits than its factorization.

687630280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011249 (or 1011245 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 687630280 is about 26222.7054286929. The cubic root of 687630280 is about 882.6428298596.

The spelling of 687630280 in words is "six hundred eighty-seven million, six hundred thirty thousand, two hundred eighty".