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28704849 = 39568283
BaseRepresentation
bin110110110000…
…0000001010001
32000000100122120
41231200001101
524322023344
62503124453
7465662415
oct155400121
960010576
1028704849
1115226418
129743729
135c40624
143b52d45
1527c0219
hex1b60051

28704849 has 4 divisors (see below), whose sum is σ = 38273136. Its totient is φ = 19136564.

The previous prime is 28704811. The next prime is 28704883. The reversal of 28704849 is 94840782.

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 28704849 - 28 = 28704593 is a prime.

It is a super-2 number, since 2×287048492 = 1647936712225602, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28704849.

It is not an unprimeable number, because it can be changed into a prime (28704889) 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, 4784139 + ... + 4784144.

It is an arithmetic number, because the mean of its divisors is an integer number (9568284).

Almost surely, 228704849 is an apocalyptic number.

It is an amenable number.

28704849 is a deficient number, since it is larger than the sum of its proper divisors (9568287).

28704849 is an equidigital number, since it uses as much as digits as its factorization.

28704849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568286.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28704849 is about 5357.6906405652. The cubic root of 28704849 is about 306.1858305648.

The spelling of 28704849 in words is "twenty-eight million, seven hundred four thousand, eight hundred forty-nine".

Divisors: 1 3 9568283 28704849