56428111 has 4 divisors (see below), whose sum is σ = 57353224. Its totient is φ = 55503000.

The previous prime is 56428103. The next prime is 56428121. The reversal of 56428111 is 11182465.

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 56428111 - 2³ = 56428103 is a prime.

It is a super-2 number, since 2×56428111² = 6368263422056642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56428111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56428121) 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, 462465 + ... + 462586.

It is an arithmetic number, because the mean of its divisors is an integer number (14338306).

Almost surely, 2^56428111 is an apocalyptic number.

56428111 is a deficient number, since it is larger than the sum of its proper divisors (925113).

56428111 is an equidigital number, since it uses as much as digits as its factorization.

56428111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925112.

The product of its digits is 1920, while the sum is 28.

The square root of 56428111 is about 7511.8646819548. The cubic root of 56428111 is about 383.5586994048.

The spelling of 56428111 in words is "fifty-six million, four hundred twenty-eight thousand, one hundred eleven".