681279825 has 24 divisors (see below), whose sum is σ = 1136364768. Its totient is φ = 360129280.

The previous prime is 681279787. The next prime is 681279877. The reversal of 681279825 is 528972186.

It is not a de Polignac number, because 681279825 - 2⁸ = 681279569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31719 + ... + 48668.

It is an arithmetic number, because the mean of its divisors is an integer number (47348532).

Almost surely, 2^681279825 is an apocalyptic number.

It is an amenable number.

681279825 is a deficient number, since it is larger than the sum of its proper divisors (455084943).

681279825 is a wasteful number, since it uses less digits than its factorization.

681279825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80513 (or 80508 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 681279825 is about 26101.3376094023. The cubic root of 681279825 is about 879.9172722679.

The spelling of 681279825 in words is "six hundred eighty-one million, two hundred seventy-nine thousand, eight hundred twenty-five".