681648744 has 64 divisors (see below), whose sum is σ = 1950359040. Its totient is φ = 194477760.

The previous prime is 681648727. The next prime is 681648749. The reversal of 681648744 is 447846186.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 681648693 and 681648702.

It is not an unprimeable number, because it can be changed into a prime (681648749) 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, 133747 + ... + 138749.

It is an arithmetic number, because the mean of its divisors is an integer number (30474360).

Almost surely, 2^681648744 is an apocalyptic number.

It is an amenable number.

681648744 is an abundant number, since it is smaller than the sum of its proper divisors (1268710296).

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

681648744 is a wasteful number, since it uses less digits than its factorization.

681648744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5830 (or 5826 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 48.

The square root of 681648744 is about 26108.4037045546. The cubic root of 681648744 is about 880.0760712476.

The spelling of 681648744 in words is "six hundred eighty-one million, six hundred forty-eight thousand, seven hundred forty-four".