17728057 has 4 divisors (see below), whose sum is σ = 17867776. Its totient is φ = 17588340.

The previous prime is 17728049. The next prime is 17728079. The reversal of 17728057 is 75082771.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75082771 = 479 ⋅156749.

It is a cyclic number.

It is not a de Polignac number, because 17728057 - 2³ = 17728049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17728027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69669 + ... + 69922.

It is an arithmetic number, because the mean of its divisors is an integer number (4466944).

Almost surely, 2^17728057 is an apocalyptic number.

It is an amenable number.

17728057 is a deficient number, since it is larger than the sum of its proper divisors (139719).

17728057 is a wasteful number, since it uses less digits than its factorization.

17728057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139718.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 17728057 is about 4210.4699262671. The cubic root of 17728057 is about 260.7476360629.

The spelling of 17728057 in words is "seventeen million, seven hundred twenty-eight thousand, fifty-seven".