28784451 has 8 divisors (see below), whose sum is σ = 40636944. Its totient is φ = 18060800.

The previous prime is 28784447. The next prime is 28784467. The reversal of 28784451 is 15448782.

It is a happy number.

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

It is not a de Polignac number, because 28784451 - 2² = 28784447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28784051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282150 + ... + 282251.

It is an arithmetic number, because the mean of its divisors is an integer number (5079618).

Almost surely, 2^28784451 is an apocalyptic number.

28784451 is a deficient number, since it is larger than the sum of its proper divisors (11852493).

28784451 is a wasteful number, since it uses less digits than its factorization.

28784451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564421.

The product of its digits is 71680, while the sum is 39.

The square root of 28784451 is about 5365.1142578700. The cubic root of 28784451 is about 306.4685993910.

The spelling of 28784451 in words is "twenty-eight million, seven hundred eighty-four thousand, four hundred fifty-one".