687144264 has 32 divisors (see below), whose sum is σ = 1773277440. Its totient is φ = 221659200.

The previous prime is 687144259. The next prime is 687144281. The reversal of 687144264 is 462441786.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 461047 + ... + 462534.

It is an arithmetic number, because the mean of its divisors is an integer number (55414920).

Almost surely, 2^687144264 is an apocalyptic number.

It is an amenable number.

687144264 is an abundant number, since it is smaller than the sum of its proper divisors (1086133176).

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

687144264 is a wasteful number, since it uses less digits than its factorization.

687144264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923621 (or 923617 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 687144264 is about 26213.4367071546. The cubic root of 687144264 is about 882.4348306596.

The spelling of 687144264 in words is "six hundred eighty-seven million, one hundred forty-four thousand, two hundred sixty-four".