56781428 has 72 divisors (see below), whose sum is σ = 118512576. Its totient is φ = 23696640.

The previous prime is 56781419. The next prime is 56781463. The reversal of 56781428 is 82418765.

56781428 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 23 ways as a sum of consecutive naturals, for example, 551225 + ... + 551327.

It is an arithmetic number, because the mean of its divisors is an integer number (1646008).

Almost surely, 2^56781428 is an apocalyptic number.

It is an amenable number.

56781428 is an abundant number, since it is smaller than the sum of its proper divisors (61731148).

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

56781428 is a wasteful number, since it uses less digits than its factorization.

56781428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 200 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 56781428 is about 7535.3452475650. The cubic root of 56781428 is about 384.3575680552.

The spelling of 56781428 in words is "fifty-six million, seven hundred eighty-one thousand, four hundred twenty-eight".