56428440 has 128 divisors (see below), whose sum is σ = 181440000. Its totient is φ = 13989888.

The previous prime is 56428439. The next prime is 56428459. The reversal of 56428440 is 4482465.

56428440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283461 + ... + 283659.

It is an arithmetic number, because the mean of its divisors is an integer number (1417500).

Almost surely, 2^56428440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56428440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90720000).

56428440 is an abundant number, since it is smaller than the sum of its proper divisors (125011560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56428440 is a wasteful number, since it uses less digits than its factorization.

56428440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 56428440 is about 7511.8865806134. The cubic root of 56428440 is about 383.5594448404.

The spelling of 56428440 in words is "fifty-six million, four hundred twenty-eight thousand, four hundred forty".