28578017 has 4 divisors (see below), whose sum is σ = 30776340. Its totient is φ = 26379696.

The previous prime is 28577987. The next prime is 28578019. The reversal of 28578017 is 71087582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5958481 + 22619536 = 2441^2 + 4756^2 .

It is a cyclic number.

It is not a de Polignac number, because 28578017 - 2⁶ = 28577953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28578019) 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, 1099142 + ... + 1099167.

It is an arithmetic number, because the mean of its divisors is an integer number (7694085).

Almost surely, 2^28578017 is an apocalyptic number.

It is an amenable number.

28578017 is a deficient number, since it is larger than the sum of its proper divisors (2198323).

28578017 is a wasteful number, since it uses less digits than its factorization.

28578017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198322.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 28578017 is about 5345.8410937850. The cubic root of 28578017 is about 305.7342053805.

The spelling of 28578017 in words is "twenty-eight million, five hundred seventy-eight thousand, seventeen".