681385758 has 32 divisors (see below), whose sum is σ = 1381387392. Its totient is φ = 224047200.

The previous prime is 681385739. The next prime is 681385759. The reversal of 681385758 is 857583186.

It is a self number, because there is not a number n which added to its sum of digits gives 681385758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681385759) 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, 133473 + ... + 138483.

It is an arithmetic number, because the mean of its divisors is an integer number (43168356).

Almost surely, 2^681385758 is an apocalyptic number.

681385758 is an abundant number, since it is smaller than the sum of its proper divisors (700001634).

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

681385758 is a wasteful number, since it uses less digits than its factorization.

681385758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5320.

The product of its digits is 1612800, while the sum is 51.

The square root of 681385758 is about 26103.3667943428. The cubic root of 681385758 is about 879.9628763609.

The spelling of 681385758 in words is "six hundred eighty-one million, three hundred eighty-five thousand, seven hundred fifty-eight".