728644651 has 6 divisors (see below), whose sum is σ = 847607100. Its totient is φ = 624552516.

The previous prime is 728644649. The next prime is 728644703. The reversal of 728644651 is 156446827.

It is not a de Polignac number, because 728644651 - 2¹ = 728644649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728644598 and 728644607.

It is not an unprimeable number, because it can be changed into a prime (728644051) 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 5 ways as a sum of consecutive naturals, for example, 7435101 + ... + 7435198.

It is an arithmetic number, because the mean of its divisors is an integer number (141267850).

Almost surely, 2^728644651 is an apocalyptic number.

728644651 is a deficient number, since it is larger than the sum of its proper divisors (118962449).

728644651 is a wasteful number, since it uses less digits than its factorization.

728644651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14870313 (or 14870306 counting only the distinct ones).

The product of its digits is 322560, while the sum is 43.

The square root of 728644651 is about 26993.4186608514. The cubic root of 728644651 is about 899.8537420767.

The spelling of 728644651 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, six hundred fifty-one".