728093939 has 4 divisors (see below), whose sum is σ = 733652040. Its totient is φ = 722535840.

The previous prime is 728093909. The next prime is 728093963. The reversal of 728093939 is 939390827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939390827 = 25391 ⋅36997.

It is a cyclic number.

It is not a de Polignac number, because 728093939 - 2¹⁶ = 728028403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728093909) 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, 2778854 + ... + 2779115.

It is an arithmetic number, because the mean of its divisors is an integer number (183413010).

Almost surely, 2^728093939 is an apocalyptic number.

728093939 is a deficient number, since it is larger than the sum of its proper divisors (5558101).

728093939 is a wasteful number, since it uses less digits than its factorization.

728093939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558100.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 728093939 is about 26983.2158757995. The cubic root of 728093939 is about 899.6269808086.

The spelling of 728093939 in words is "seven hundred twenty-eight million, ninety-three thousand, nine hundred thirty-nine".