728741646 has 24 divisors (see below), whose sum is σ = 1579461624. Its totient is φ = 242833680.

The previous prime is 728741617. The next prime is 728741681. The reversal of 728741646 is 646147827.

It is a super-2 number, since 2×728741646² = 1062128773229578632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 79101 + ... + 87831.

It is an arithmetic number, because the mean of its divisors is an integer number (65810901).

Almost surely, 2^728741646 is an apocalyptic number.

728741646 is an abundant number, since it is smaller than the sum of its proper divisors (850719978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728741646 is a wasteful number, since it uses less digits than its factorization.

728741646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13376 (or 13373 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 728741646 is about 26995.2152427055. The cubic root of 728741646 is about 899.8936689194.

The spelling of 728741646 in words is "seven hundred twenty-eight million, seven hundred forty-one thousand, six hundred forty-six".