681639315 has 64 divisors (see below), whose sum is σ = 1308106752. Its totient is φ = 296524800.

The previous prime is 681639289. The next prime is 681639317. The reversal of 681639315 is 513936186.

It is a happy number.

681639315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681639315 - 2⁸ = 681639059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681639317) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 196839 + ... + 200271.

It is an arithmetic number, because the mean of its divisors is an integer number (20439168).

Almost surely, 2^681639315 is an apocalyptic number.

681639315 is a deficient number, since it is larger than the sum of its proper divisors (626467437).

681639315 is a wasteful number, since it uses less digits than its factorization.

681639315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540.

The product of its digits is 116640, while the sum is 42.

The square root of 681639315 is about 26108.2231298876. The cubic root of 681639315 is about 880.0720133044.

The spelling of 681639315 in words is "six hundred eighty-one million, six hundred thirty-nine thousand, three hundred fifteen".