28784486 has 4 divisors (see below), whose sum is σ = 43176732. Its totient is φ = 14392242.

The previous prime is 28784467. The next prime is 28784527. The reversal of 28784486 is 68448782.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28784486.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7196120 + ... + 7196123.

It is an arithmetic number, because the mean of its divisors is an integer number (10794183).

Almost surely, 2^28784486 is an apocalyptic number.

28784486 is a deficient number, since it is larger than the sum of its proper divisors (14392246).

28784486 is a wasteful number, since it uses less digits than its factorization.

28784486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14392245.

The product of its digits is 688128, while the sum is 47.

The square root of 28784486 is about 5365.1175196821. The cubic root of 28784486 is about 306.4687236061.

The spelling of 28784486 in words is "twenty-eight million, seven hundred eighty-four thousand, four hundred eighty-six".