687977976 has 64 divisors (see below), whose sum is σ = 1995022080. Its totient is φ = 193628160.

The previous prime is 687977959. The next prime is 687977977. The reversal of 687977976 is 679779786.

It is a super-2 number, since 2×687977976² = 946627390922113152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687977977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19305 + ... + 41816.

It is an arithmetic number, because the mean of its divisors is an integer number (31172220).

Almost surely, 2^687977976 is an apocalyptic number.

It is an amenable number.

687977976 is an abundant number, since it is smaller than the sum of its proper divisors (1307044104).

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

687977976 is a wasteful number, since it uses less digits than its factorization.

687977976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61204 (or 61200 counting only the distinct ones).

The product of its digits is 56010528, while the sum is 66.

The square root of 687977976 is about 26229.3342652840. The cubic root of 687977976 is about 882.7915724223.

The spelling of 687977976 in words is "six hundred eighty-seven million, nine hundred seventy-seven thousand, nine hundred seventy-six".