681946584 has 32 divisors (see below), whose sum is σ = 1859855040. Its totient is φ = 206650400.

The previous prime is 681946583. The next prime is 681946607. The reversal of 681946584 is 485649186.

681946584 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×681946584² = 930102286858538112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681946583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1291302 + ... + 1291829.

It is an arithmetic number, because the mean of its divisors is an integer number (58120470).

Almost surely, 2^681946584 is an apocalyptic number.

It is an amenable number.

681946584 is an abundant number, since it is smaller than the sum of its proper divisors (1177908456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681946584 is a wasteful number, since it uses less digits than its factorization.

681946584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583151 (or 2583147 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 51.

The square root of 681946584 is about 26114.1069921987. The cubic root of 681946584 is about 880.2042329004.

The spelling of 681946584 in words is "six hundred eighty-one million, nine hundred forty-six thousand, five hundred eighty-four".