681724066 has 8 divisors (see below), whose sum is σ = 1076406480. Its totient is φ = 322921908.

The previous prime is 681724031. The next prime is 681724073. The reversal of 681724066 is 660427186.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8970016 + ... + 8970091.

It is an arithmetic number, because the mean of its divisors is an integer number (134550810).

Almost surely, 2^681724066 is an apocalyptic number.

681724066 is a deficient number, since it is larger than the sum of its proper divisors (394682414).

681724066 is a wasteful number, since it uses less digits than its factorization.

681724066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17940128.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 681724066 is about 26109.8461504468. The cubic root of 681724066 is about 880.1084861088.

The spelling of 681724066 in words is "six hundred eighty-one million, seven hundred twenty-four thousand, sixty-six".