728644378 has 32 divisors (see below), whose sum is σ = 1442821248. Its totient is φ = 267187200.

The previous prime is 728644373. The next prime is 728644403. The reversal of 728644378 is 873446827.

It is not an unprimeable number, because it can be changed into a prime (728644373) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 136543 + ... + 141778.

It is an arithmetic number, because the mean of its divisors is an integer number (45088164).

Almost surely, 2^728644378 is an apocalyptic number.

728644378 is a deficient number, since it is larger than the sum of its proper divisors (714176870).

728644378 is a wasteful number, since it uses less digits than its factorization.

728644378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278358.

The product of its digits is 1806336, while the sum is 49.

The square root of 728644378 is about 26993.4136040628. The cubic root of 728644378 is about 899.8536296945.

The spelling of 728644378 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, three hundred seventy-eight".