728779 has 4 divisors (see below), whose sum is σ = 752320. Its totient is φ = 705240.

The previous prime is 728771. The next prime is 728809. The reversal of 728779 is 977827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977827 = 601 ⋅1627.

It is a cyclic number.

It is not a de Polignac number, because 728779 - 2³ = 728771 is a prime.

It is a super-2 number, since 2×728779² = 1062237661682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728771) 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, 11724 + ... + 11785.

It is an arithmetic number, because the mean of its divisors is an integer number (188080).

2⁷²⁸⁷⁷⁹ is an apocalyptic number.

728779 is a deficient number, since it is larger than the sum of its proper divisors (23541).

728779 is a wasteful number, since it uses less digits than its factorization.

728779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23540.

The product of its digits is 49392, while the sum is 40.

The square root of 728779 is about 853.6855392942. The cubic root of 728779 is about 89.9909044306.

The spelling of 728779 in words is "seven hundred twenty-eight thousand, seven hundred seventy-nine".