728644642 has 32 divisors (see below), whose sum is σ = 1257062400. Its totient is φ = 313275600.

The previous prime is 728644627. The next prime is 728644649. The reversal of 728644642 is 246446827.

728644642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (728644649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413359 + ... + 415117.

It is an arithmetic number, because the mean of its divisors is an integer number (39283200).

Almost surely, 2^728644642 is an apocalyptic number.

728644642 is a deficient number, since it is larger than the sum of its proper divisors (528417758).

728644642 is a wasteful number, since it uses less digits than its factorization.

728644642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782.

The product of its digits is 516096, while the sum is 43.

The square root of 728644642 is about 26993.4184941441. The cubic root of 728644642 is about 899.8537383718.

The spelling of 728644642 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, six hundred forty-two".