681540930 has 96 divisors (see below), whose sum is σ = 2045392128. Its totient is φ = 154224000.

The previous prime is 681540929. The next prime is 681540947. The reversal of 681540930 is 39045186.

681540930 is a `hidden beast` number, since 6 + 81 + 540 + 9 + 30 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58275 + ... + 68985.

It is an arithmetic number, because the mean of its divisors is an integer number (21306168).

Almost surely, 2^681540930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681540930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1022696064).

681540930 is an abundant number, since it is smaller than the sum of its proper divisors (1363851198).

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

681540930 is a wasteful number, since it uses less digits than its factorization.

681540930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10832 (or 10829 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 681540930 is about 26106.3388854125. The cubic root of 681540930 is about 880.0296692821.

The spelling of 681540930 in words is "six hundred eighty-one million, five hundred forty thousand, nine hundred thirty".