681773520 has 40 divisors (see below), whose sum is σ = 2113498656. Its totient is φ = 181806208.

The previous prime is 681773501. The next prime is 681773531. The reversal of 681773520 is 25377186.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1420122 + ... + 1420601.

Almost surely, 2^681773520 is an apocalyptic number.

681773520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681773520 is an abundant number, since it is smaller than the sum of its proper divisors (1431725136).

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

681773520 is a wasteful number, since it uses less digits than its factorization.

681773520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2840739 (or 2840733 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 681773520 is about 26110.7931706411. The cubic root of 681773520 is about 880.1297673646.

The spelling of 681773520 in words is "six hundred eighty-one million, seven hundred seventy-three thousand, five hundred twenty".