731331028 has 12 divisors (see below), whose sum is σ = 1291156020. Its totient is φ = 362429312.

The previous prime is 731330989. The next prime is 731331079. The reversal of 731331028 is 820133137.

It can be written as a sum of positive squares in 2 ways, for example, as 204261264 + 527069764 = 14292^2 + 22958^2 .

It is a junction number, because it is equal to n+sod(n) for n = 731330987 and 731331005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808543 + ... + 809446.

It is an arithmetic number, because the mean of its divisors is an integer number (107596335).

Almost surely, 2^731331028 is an apocalyptic number.

It is an amenable number.

731331028 is a deficient number, since it is larger than the sum of its proper divisors (559824992).

731331028 is a wasteful number, since it uses less digits than its factorization.

731331028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1618106 (or 1618104 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 731331028 is about 27043.1327327290. The cubic root of 731331028 is about 900.9582501494.

The spelling of 731331028 in words is "seven hundred thirty-one million, three hundred thirty-one thousand, twenty-eight".