681634594 has 32 divisors (see below), whose sum is σ = 1069689600. Its totient is φ = 325503360.

The previous prime is 681634571. The next prime is 681634607. The reversal of 681634594 is 495436186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 900064 + ... + 900820.

It is an arithmetic number, because the mean of its divisors is an integer number (33427800).

Almost surely, 2^681634594 is an apocalyptic number.

681634594 is a deficient number, since it is larger than the sum of its proper divisors (388055006).

681634594 is a wasteful number, since it uses less digits than its factorization.

681634594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018.

The product of its digits is 622080, while the sum is 46.

The square root of 681634594 is about 26108.1327176035. The cubic root of 681634594 is about 880.0699815214.

The spelling of 681634594 in words is "six hundred eighty-one million, six hundred thirty-four thousand, five hundred ninety-four".