56728422 has 48 divisors (see below), whose sum is σ = 131667120. Its totient is φ = 17588736.

The previous prime is 56728421. The next prime is 56728429. The reversal of 56728422 is 22482765.

It is a super-2 number, since 2×56728422² = 6436227725220168, which contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 26193 + ... + 28275.

It is an arithmetic number, because the mean of its divisors is an integer number (2743065).

Almost surely, 2^56728422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56728422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65833560).

56728422 is an abundant number, since it is smaller than the sum of its proper divisors (74938698).

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

56728422 is a wasteful number, since it uses less digits than its factorization.

56728422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197 (or 2194 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 56728422 is about 7531.8272683327. The cubic root of 56728422 is about 384.2379303449.

The spelling of 56728422 in words is "fifty-six million, seven hundred twenty-eight thousand, four hundred twenty-two".