681662440 has 32 divisors (see below), whose sum is σ = 1534880160. Its totient is φ = 272462400.

The previous prime is 681662419. The next prime is 681662461. The reversal of 681662440 is 44266186.

681662440 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (681662419) and next prime (681662461).

It is a self number, because there is not a number n which added to its sum of digits gives 681662440.

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, 55675 + ... + 66805.

It is an arithmetic number, because the mean of its divisors is an integer number (47965005).

Almost surely, 2^681662440 is an apocalyptic number.

It is an amenable number.

681662440 is an abundant number, since it is smaller than the sum of its proper divisors (853217720).

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

681662440 is a wasteful number, since it uses less digits than its factorization.

681662440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12673 (or 12669 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 681662440 is about 26108.6659942633. The cubic root of 681662440 is about 880.0819655058.

The spelling of 681662440 in words is "six hundred eighty-one million, six hundred sixty-two thousand, four hundred forty".