28727817 has 4 divisors (see below), whose sum is σ = 38303760. Its totient is φ = 19151876.

The previous prime is 28727813. The next prime is 28727819. The reversal of 28727817 is 71872782.

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.

It is a cyclic number.

It is not a de Polignac number, because 28727817 - 2² = 28727813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28727813) 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, 4787967 + ... + 4787972.

It is an arithmetic number, because the mean of its divisors is an integer number (9575940).

Almost surely, 2^28727817 is an apocalyptic number.

It is an amenable number.

28727817 is a deficient number, since it is larger than the sum of its proper divisors (9575943).

28727817 is an equidigital number, since it uses as much as digits as its factorization.

28727817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9575942.

The product of its digits is 87808, while the sum is 42.

The square root of 28727817 is about 5359.8336727925. The cubic root of 28727817 is about 306.2674730000.

The spelling of 28727817 in words is "twenty-eight million, seven hundred twenty-seven thousand, eight hundred seventeen".