681634040 has 32 divisors (see below), whose sum is σ = 1623894480. Its totient is φ = 256614912.

The previous prime is 681634039. The next prime is 681634073. The reversal of 681634040 is 40436186.

It is a junction number, because it is equal to n+sod(n) for n = 681633988 and 681634006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500522 + ... + 501881.

Almost surely, 2^681634040 is an apocalyptic number.

It is an amenable number.

681634040 is an abundant number, since it is smaller than the sum of its proper divisors (942260440).

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

681634040 is a wasteful number, since it uses less digits than its factorization.

681634040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002431 (or 1002427 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 681634040 is about 26108.1221078805. The cubic root of 681634040 is about 880.0697430951.

The spelling of 681634040 in words is "six hundred eighty-one million, six hundred thirty-four thousand, forty".