28004986 has 8 divisors (see below), whose sum is σ = 42062580. Its totient is φ = 13984128.

The previous prime is 28004983. The next prime is 28004987. The reversal of 28004986 is 68940082.

It can be written as a sum of positive squares in 2 ways, for example, as 25050025 + 2954961 = 5005^2 + 1719^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28004983) 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, 7191 + ... + 10378.

Almost surely, 2^28004986 is an apocalyptic number.

28004986 is a deficient number, since it is larger than the sum of its proper divisors (14057594).

28004986 is a wasteful number, since it uses less digits than its factorization.

28004986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18368.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28004986 is about 5291.9737338728. The cubic root of 28004986 is about 303.6769204423.

The spelling of 28004986 in words is "twenty-eight million, four thousand, nine hundred eighty-six".