681173772 has 12 divisors (see below), whose sum is σ = 1589405496. Its totient is φ = 227057920.

The previous prime is 681173761. The next prime is 681173783. The reversal of 681173772 is 277371186.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (681173761) and next prime (681173783).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28382229 + ... + 28382252.

It is an arithmetic number, because the mean of its divisors is an integer number (132450458).

Almost surely, 2^681173772 is an apocalyptic number.

It is an amenable number.

681173772 is an abundant number, since it is smaller than the sum of its proper divisors (908231724).

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

681173772 is a wasteful number, since it uses less digits than its factorization.

681173772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56764488 (or 56764486 counting only the distinct ones).

The product of its digits is 98784, while the sum is 42.

The square root of 681173772 is about 26099.3059677839. The cubic root of 681173772 is about 879.8716117793.

The spelling of 681173772 in words is "six hundred eighty-one million, one hundred seventy-three thousand, seven hundred seventy-two".