681258394 has 8 divisors (see below), whose sum is σ = 1022010228. Its totient is φ = 340588320.

The previous prime is 681258379. The next prime is 681258463. The reversal of 681258394 is 493852186.

681258394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 656128225 + 25130169 = 25615^2 + 5013^2 .

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

It is a super-2 number, since 2×681258394² = 928225998790918472, which contains 22 as substring.

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, 8704 + ... + 37924.

Almost surely, 2^681258394 is an apocalyptic number.

681258394 is a deficient number, since it is larger than the sum of its proper divisors (340751834).

681258394 is a wasteful number, since it uses less digits than its factorization.

681258394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40880.

The product of its digits is 414720, while the sum is 46.

The square root of 681258394 is about 26100.9270716578. The cubic root of 681258394 is about 879.9080456603.

The spelling of 681258394 in words is "six hundred eighty-one million, two hundred fifty-eight thousand, three hundred ninety-four".