720681831 has 12 divisors (see below), whose sum is σ = 1074565440. Its totient is φ = 464955840.

The previous prime is 720681827. The next prime is 720681847. The reversal of 720681831 is 138186027.

It is not a de Polignac number, because 720681831 - 2² = 720681827 is a prime.

It is a super-2 number, since 2×720681831² = 1038764603067025122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720681851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1291266 + ... + 1291823.

It is an arithmetic number, because the mean of its divisors is an integer number (89547120).

Almost surely, 2^720681831 is an apocalyptic number.

720681831 is a deficient number, since it is larger than the sum of its proper divisors (353883609).

720681831 is a wasteful number, since it uses less digits than its factorization.

720681831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583126 (or 2583123 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 720681831 is about 26845.5178940545. The cubic root of 720681831 is about 896.5637823356.

The spelling of 720681831 in words is "seven hundred twenty million, six hundred eighty-one thousand, eight hundred thirty-one".