681528940 has 12 divisors (see below), whose sum is σ = 1431210816. Its totient is φ = 272611568.

The previous prime is 681528923. The next prime is 681528979. The reversal of 681528940 is 49825186.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17038204 + ... + 17038243.

It is an arithmetic number, because the mean of its divisors is an integer number (119267568).

Almost surely, 2^681528940 is an apocalyptic number.

It is an amenable number.

681528940 is an abundant number, since it is smaller than the sum of its proper divisors (749681876).

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

681528940 is a wasteful number, since it uses less digits than its factorization.

681528940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34076456 (or 34076454 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 681528940 is about 26106.1092466878. The cubic root of 681528940 is about 880.0245086149.

The spelling of 681528940 in words is "six hundred eighty-one million, five hundred twenty-eight thousand, nine hundred forty".