728644597 has 4 divisors (see below), whose sum is σ = 730709100. Its totient is φ = 726580096.

The previous prime is 728644591. The next prime is 728644607. The reversal of 728644597 is 795446827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 795446827 = 7 ⋅113635261.

It can be written as a sum of positive squares in 2 ways, for example, as 419799121 + 308845476 = 20489^2 + 17574^2 .

It is a cyclic number.

It is not a de Polignac number, because 728644597 - 2²⁷ = 594426869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728644591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031722 + ... + 1032427.

It is an arithmetic number, because the mean of its divisors is an integer number (182677275).

Almost surely, 2^728644597 is an apocalyptic number.

It is an amenable number.

728644597 is a deficient number, since it is larger than the sum of its proper divisors (2064503).

728644597 is a wasteful number, since it uses less digits than its factorization.

728644597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064502.

The product of its digits is 3386880, while the sum is 52.

The square root of 728644597 is about 26993.4176606076. The cubic root of 728644597 is about 899.8537198473.

The spelling of 728644597 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, five hundred ninety-seven".