57728705 has 8 divisors (see below), whose sum is σ = 71663400. Its totient is φ = 44590336.

The previous prime is 57728701. The next prime is 57728711. The reversal of 57728705 is 50782775.

It can be written as a sum of positive squares in 4 ways, for example, as 16679056 + 41049649 = 4084^2 + 6407^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57728705 - 2² = 57728701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57728701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198920 + ... + 199209.

It is an arithmetic number, because the mean of its divisors is an integer number (8957925).

Almost surely, 2^57728705 is an apocalyptic number.

It is an amenable number.

57728705 is a deficient number, since it is larger than the sum of its proper divisors (13934695).

57728705 is a wasteful number, since it uses less digits than its factorization.

57728705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398163.

The product of its (nonzero) digits is 137200, while the sum is 41.

The square root of 57728705 is about 7597.9408394643. The cubic root of 57728705 is about 386.4831864165.

The spelling of 57728705 in words is "fifty-seven million, seven hundred twenty-eight thousand, seven hundred five".