681738897 has 32 divisors (see below), whose sum is σ = 1056648960. Its totient is φ = 382924800.

The previous prime is 681738881. The next prime is 681738917. The reversal of 681738897 is 798837186.

It is not a de Polignac number, because 681738897 - 2⁴ = 681738881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681738817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 614179 + ... + 615287.

It is an arithmetic number, because the mean of its divisors is an integer number (33020280).

Almost surely, 2^681738897 is an apocalyptic number.

It is an amenable number.

681738897 is a deficient number, since it is larger than the sum of its proper divisors (374910063).

681738897 is a wasteful number, since it uses less digits than its factorization.

681738897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593.

The product of its digits is 4064256, while the sum is 57.

The square root of 681738897 is about 26110.1301605335. The cubic root of 681738897 is about 880.1148683559.

The spelling of 681738897 in words is "six hundred eighty-one million, seven hundred thirty-eight thousand, eight hundred ninety-seven".