687565740 has 48 divisors (see below), whose sum is σ = 1987292160. Its totient is φ = 177435840.

The previous prime is 687565733. The next prime is 687565741. The reversal of 687565740 is 47565786.

It is a self number, because there is not a number n which added to its sum of digits gives 687565740.

It is not an unprimeable number, because it can be changed into a prime (687565741) 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, 182970 + ... + 186689.

It is an arithmetic number, because the mean of its divisors is an integer number (41401920).

Almost surely, 2^687565740 is an apocalyptic number.

687565740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

687565740 is an abundant number, since it is smaller than the sum of its proper divisors (1299726420).

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

687565740 is a wasteful number, since it uses less digits than its factorization.

687565740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369702 (or 369700 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 48.

The square root of 687565740 is about 26221.4747868994. The cubic root of 687565740 is about 882.6152144621.

The spelling of 687565740 in words is "six hundred eighty-seven million, five hundred sixty-five thousand, seven hundred forty".