728642503 has 4 divisors (see below), whose sum is σ = 729470448. Its totient is φ = 727814560.

The previous prime is 728642489. The next prime is 728642531. The reversal of 728642503 is 305246827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728642503 - 2⁵ = 728642471 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 (728642303) 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, 412651 + ... + 414412.

It is an arithmetic number, because the mean of its divisors is an integer number (182367612).

Almost surely, 2^728642503 is an apocalyptic number.

728642503 is a deficient number, since it is larger than the sum of its proper divisors (827945).

728642503 is an equidigital number, since it uses as much as digits as its factorization.

728642503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827944.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 728642503 is about 26993.3788733460. The cubic root of 728642503 is about 899.8528578379.

The spelling of 728642503 in words is "seven hundred twenty-eight million, six hundred forty-two thousand, five hundred three".