731070728 has 16 divisors (see below), whose sum is σ = 1379837760. Its totient is φ = 363114000.

The previous prime is 731070707. The next prime is 731070749. The reversal of 731070728 is 827070137.

It is an interprime number because it is at equal distance from previous prime (731070707) and next prime (731070749).

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301388 + ... + 303803.

It is an arithmetic number, because the mean of its divisors is an integer number (86239860).

Almost surely, 2^731070728 is an apocalyptic number.

It is an amenable number.

731070728 is a deficient number, since it is larger than the sum of its proper divisors (648767032).

731070728 is a wasteful number, since it uses less digits than its factorization.

731070728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605348 (or 605344 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 731070728 is about 27038.3196223434. The cubic root of 731070728 is about 900.8513458644.

The spelling of 731070728 in words is "seven hundred thirty-one million, seventy thousand, seven hundred twenty-eight".