681820460 has 24 divisors (see below), whose sum is σ = 1470522480. Its totient is φ = 265356864.

The previous prime is 681820457. The next prime is 681820463. The reversal of 681820460 is 64028186.

It is an interprime number because it is at equal distance from previous prime (681820457) and next prime (681820463).

It is a super-2 number, since 2×681820460² = 929758279349223200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681820460.

It is not an unprimeable number, because it can be changed into a prime (681820463) 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, 459950 + ... + 461429.

It is an arithmetic number, because the mean of its divisors is an integer number (61271770).

Almost surely, 2^681820460 is an apocalyptic number.

It is an amenable number.

681820460 is an abundant number, since it is smaller than the sum of its proper divisors (788702020).

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

681820460 is a wasteful number, since it uses less digits than its factorization.

681820460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921425 (or 921423 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 681820460 is about 26111.6920171788. The cubic root of 681820460 is about 880.1499658332.

The spelling of 681820460 in words is "six hundred eighty-one million, eight hundred twenty thousand, four hundred sixty".