687794883556 has 135 divisors (see below), whose sum is σ = 1393416211705. Its totient is φ = 297034265440.

The previous prime is 687794883553. The next prime is 687794883557. The reversal of 687794883556 is 655388497786.

The square root of 687794883556 is 829334.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 80579905956 + 607214977600 = 283866^2 + 779240^2 .

It is a Duffinian number.

Its product of digits (2438553600) is a multiple of the sum of its prime factors (392).

It is not an unprimeable number, because it can be changed into a prime (687794883553) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 4616072970 + ... + 4616073118.

Almost surely, 2^687794883556 is an apocalyptic number.

687794883556 is the 829334-th square number.

It is an amenable number.

687794883556 is an abundant number, since it is smaller than the sum of its proper divisors (705621328149).

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

687794883556 is an equidigital number, since it uses as much as digits as its factorization.

687794883556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 185 counting only the distinct ones).

The product of its digits is 2438553600, while the sum is 76.

The spelling of 687794883556 in words is "six hundred eighty-seven billion, seven hundred ninety-four million, eight hundred eighty-three thousand, five hundred fifty-six".