681747830 has 16 divisors (see below), whose sum is σ = 1280500704. Its totient is φ = 260842560.

The previous prime is 681747817. The next prime is 681747883. The reversal of 681747830 is 38747186.

It is a congruent number.

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, 1481831 + ... + 1482290.

It is an arithmetic number, because the mean of its divisors is an integer number (80031294).

Almost surely, 2^681747830 is an apocalyptic number.

681747830 is a deficient number, since it is larger than the sum of its proper divisors (598752874).

681747830 is a wasteful number, since it uses less digits than its factorization.

681747830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2964151.

The product of its (nonzero) digits is 225792, while the sum is 44.

The square root of 681747830 is about 26110.3012238465. The cubic root of 681747830 is about 880.1187124629.

The spelling of 681747830 in words is "six hundred eighty-one million, seven hundred forty-seven thousand, eight hundred thirty".