681866824 has 48 divisors (see below), whose sum is σ = 1352056320. Its totient is φ = 322045920.

The previous prime is 681866807. The next prime is 681866833. The reversal of 681866824 is 428668186.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 457809 + ... + 459295.

It is an arithmetic number, because the mean of its divisors is an integer number (28167840).

Almost surely, 2^681866824 is an apocalyptic number.

It is an amenable number.

681866824 is a deficient number, since it is larger than the sum of its proper divisors (670189496).

681866824 is a wasteful number, since it uses less digits than its factorization.

681866824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610 (or 1563 counting only the distinct ones).

The product of its digits is 884736, while the sum is 49.

The square root of 681866824 is about 26112.5798036119. The cubic root of 681866824 is about 880.1699155367.

The spelling of 681866824 in words is "six hundred eighty-one million, eight hundred sixty-six thousand, eight hundred twenty-four".