57728440 has 64 divisors (see below), whose sum is σ = 161948160. Its totient is φ = 17992320.

The previous prime is 57728431. The next prime is 57728449. The reversal of 57728440 is 4482775.

It is an interprime number because it is at equal distance from previous prime (57728431) and next prime (57728449).

It is a self number, because there is not a number n which added to its sum of digits gives 57728440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57728449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6292 + ... + 12451.

It is an arithmetic number, because the mean of its divisors is an integer number (2530440).

Almost surely, 2^57728440 is an apocalyptic number.

It is an amenable number.

57728440 is an abundant number, since it is smaller than the sum of its proper divisors (104219720).

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

57728440 is a wasteful number, since it uses less digits than its factorization.

57728440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18772 (or 18768 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 57728440 is about 7597.9234005089. The cubic root of 57728440 is about 386.4825950400.

The spelling of 57728440 in words is "fifty-seven million, seven hundred twenty-eight thousand, four hundred forty".