56728223 has 4 divisors (see below), whose sum is σ = 58047528. Its totient is φ = 55408920.

The previous prime is 56728213. The next prime is 56728229. The reversal of 56728223 is 32282765.

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 56728223 - 2⁴ = 56728207 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 (56728229) 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, 659588 + ... + 659673.

It is an arithmetic number, because the mean of its divisors is an integer number (14511882).

Almost surely, 2^56728223 is an apocalyptic number.

56728223 is a deficient number, since it is larger than the sum of its proper divisors (1319305).

56728223 is a wasteful number, since it uses less digits than its factorization.

56728223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319304.

The product of its digits is 40320, while the sum is 35.

The square root of 56728223 is about 7531.8140577154. The cubic root of 56728223 is about 384.2374810497.

The spelling of 56728223 in words is "fifty-six million, seven hundred twenty-eight thousand, two hundred twenty-three".