681818974 has 16 divisors (see below), whose sum is σ = 1029996000. Its totient is φ = 338494464.

The previous prime is 681818957. The next prime is 681818987. The reversal of 681818974 is 479818186.

It is a happy number.

It is a super-2 number, since 2×681818974² = 929754226612825352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228162 + ... + 231130.

It is an arithmetic number, because the mean of its divisors is an integer number (64374750).

Almost surely, 2^681818974 is an apocalyptic number.

681818974 is a deficient number, since it is larger than the sum of its proper divisors (348177026).

681818974 is a wasteful number, since it uses less digits than its factorization.

681818974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3747.

The product of its digits is 774144, while the sum is 52.

The square root of 681818974 is about 26111.6635624772. The cubic root of 681818974 is about 880.1493264157.

The spelling of 681818974 in words is "six hundred eighty-one million, eight hundred eighteen thousand, nine hundred seventy-four".