687655080 has 96 divisors (see below), whose sum is σ = 2554156800. Its totient is φ = 157177728.

The previous prime is 687655079. The next prime is 687655099. The reversal of 687655080 is 80556786.

687655080 is a `hidden beast` number, since 6 + 87 + 65 + 508 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133920 + ... + 138959.

It is an arithmetic number, because the mean of its divisors is an integer number (26605800).

Almost surely, 2^687655080 is an apocalyptic number.

687655080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687655080 is an abundant number, since it is smaller than the sum of its proper divisors (1866501720).

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

687655080 is a wasteful number, since it uses less digits than its factorization.

687655080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272903 (or 272896 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The square root of 687655080 is about 26223.1782970715. The cubic root of 687655080 is about 882.6534408326.

The spelling of 687655080 in words is "six hundred eighty-seven million, six hundred fifty-five thousand, eighty".