28136965 has 4 divisors (see below), whose sum is σ = 33764364. Its totient is φ = 22509568.

The previous prime is 28136951. The next prime is 28136971. The reversal of 28136965 is 56963182.

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 12723489 + 15413476 = 3567^2 + 3926^2 .

It is a cyclic number.

It is not a de Polignac number, because 28136965 - 2⁷ = 28136837 is a prime.

It is a super-2 number, since 2×28136965² = 1583377598822450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2813692 + ... + 2813701.

It is an arithmetic number, because the mean of its divisors is an integer number (8441091).

Almost surely, 2^28136965 is an apocalyptic number.

It is an amenable number.

28136965 is a deficient number, since it is larger than the sum of its proper divisors (5627399).

28136965 is an equidigital number, since it uses as much as digits as its factorization.

28136965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627398.

The product of its digits is 77760, while the sum is 40.

The square root of 28136965 is about 5304.4288099663. The cubic root of 28136965 is about 304.1532187295.

The spelling of 28136965 in words is "twenty-eight million, one hundred thirty-six thousand, nine hundred sixty-five".