681762020 has 24 divisors (see below), whose sum is σ = 1432213944. Its totient is φ = 272606976.

The previous prime is 681762001. The next prime is 681762041. The reversal of 681762020 is 20267186.

It can be written as a sum of positive squares in 4 ways, for example, as 34975396 + 646786624 = 5914^2 + 25432^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81974 + ... + 89906.

It is an arithmetic number, because the mean of its divisors is an integer number (59675581).

Almost surely, 2^681762020 is an apocalyptic number.

It is an amenable number.

681762020 is an abundant number, since it is smaller than the sum of its proper divisors (750451924).

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

681762020 is a wasteful number, since it uses less digits than its factorization.

681762020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12239 (or 12237 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 681762020 is about 26110.5729542651. The cubic root of 681762020 is about 880.1248187274.

The spelling of 681762020 in words is "six hundred eighty-one million, seven hundred sixty-two thousand, twenty".