728013939 has 4 divisors (see below), whose sum is σ = 970685256. Its totient is φ = 485342624.

The previous prime is 728013919. The next prime is 728013971. The reversal of 728013939 is 939310827.

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 728013939 - 2²⁴ = 711236723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 728013939.

It is not an unprimeable number, because it can be changed into a prime (728013919) 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, 121335654 + ... + 121335659.

It is an arithmetic number, because the mean of its divisors is an integer number (242671314).

Almost surely, 2^728013939 is an apocalyptic number.

728013939 is a deficient number, since it is larger than the sum of its proper divisors (242671317).

728013939 is a wasteful number, since it uses less digits than its factorization.

728013939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242671316.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 728013939 is about 26981.7334320833. The cubic root of 728013939 is about 899.5940304842.

The spelling of 728013939 in words is "seven hundred twenty-eight million, thirteen thousand, nine hundred thirty-nine".