681273842 has 8 divisors (see below), whose sum is σ = 1075695600. Its totient is φ = 322708644.

The previous prime is 681273841. The next prime is 681273863. The reversal of 681273842 is 248372186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×681273842³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681273842.

It is not an unprimeable number, because it can be changed into a prime (681273841) 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, 8964092 + ... + 8964167.

It is an arithmetic number, because the mean of its divisors is an integer number (134461950).

Almost surely, 2^681273842 is an apocalyptic number.

681273842 is a deficient number, since it is larger than the sum of its proper divisors (394421758).

681273842 is a wasteful number, since it uses less digits than its factorization.

681273842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17928280.

The product of its digits is 129024, while the sum is 41.

The square root of 681273842 is about 26101.2229981662. Note that the first 3 decimals coincide. The cubic root of 681273842 is about 879.9146964489.

The spelling of 681273842 in words is "six hundred eighty-one million, two hundred seventy-three thousand, eight hundred forty-two".