681220172 has 12 divisors (see below), whose sum is σ = 1224355440. Its totient is φ = 331404336.

The previous prime is 681220171. The next prime is 681220181. The reversal of 681220172 is 271022186.

It is not an unprimeable number, because it can be changed into a prime (681220171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2301272 + ... + 2301567.

It is an arithmetic number, because the mean of its divisors is an integer number (102029620).

Almost surely, 2^681220172 is an apocalyptic number.

It is an amenable number.

681220172 is a deficient number, since it is larger than the sum of its proper divisors (543135268).

681220172 is a wasteful number, since it uses less digits than its factorization.

681220172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4602880 (or 4602878 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 681220172 is about 26100.1948651729. The cubic root of 681220172 is about 879.8915896065.

The spelling of 681220172 in words is "six hundred eighty-one million, two hundred twenty thousand, one hundred seventy-two".