57228440 has 16 divisors (see below), whose sum is σ = 128764080. Its totient is φ = 22891360.

The previous prime is 57228433. The next prime is 57228461. The reversal of 57228440 is 4482275.

57228440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 57228397 and 57228406.

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 3 ways as a sum of consecutive naturals, for example, 715316 + ... + 715395.

It is an arithmetic number, because the mean of its divisors is an integer number (8047755).

Almost surely, 2^57228440 is an apocalyptic number.

It is an amenable number.

57228440 is an abundant number, since it is smaller than the sum of its proper divisors (71535640).

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

57228440 is a wasteful number, since it uses less digits than its factorization.

57228440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430722 (or 1430718 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 57228440 is about 7564.9481161473. The cubic root of 57228440 is about 385.3635515734.

The spelling of 57228440 in words is "fifty-seven million, two hundred twenty-eight thousand, four hundred forty".