56728423 has 4 divisors (see below), whose sum is σ = 56743488. Its totient is φ = 56713360.

The previous prime is 56728421. The next prime is 56728429. The reversal of 56728423 is 32482765.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 56728423 - 2¹ = 56728421 is a prime.

It is a super-2 number, since 2×56728423² = 6436227952133858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56728421) 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, 3690 + ... + 11272.

It is an arithmetic number, because the mean of its divisors is an integer number (14185872).

Almost surely, 2^56728423 is an apocalyptic number.

56728423 is a deficient number, since it is larger than the sum of its proper divisors (15065).

56728423 is an equidigital number, since it uses as much as digits as its factorization.

56728423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15064.

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

The square root of 56728423 is about 7531.8273347177. The cubic root of 56728423 is about 384.2379326027.

The spelling of 56728423 in words is "fifty-six million, seven hundred twenty-eight thousand, four hundred twenty-three".