28313965 has 4 divisors (see below), whose sum is σ = 33976764. Its totient is φ = 22651168.

The previous prime is 28313963. The next prime is 28313969. The reversal of 28313965 is 56931382.

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 7502121 + 20811844 = 2739^2 + 4562^2 .

It is a cyclic number.

It is not a de Polignac number, because 28313965 - 2¹ = 28313963 is a prime.

It is a super-2 number, since 2×28313965² = 1603361228042450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28313963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2831392 + ... + 2831401.

It is an arithmetic number, because the mean of its divisors is an integer number (8494191).

Almost surely, 2^28313965 is an apocalyptic number.

It is an amenable number.

28313965 is a deficient number, since it is larger than the sum of its proper divisors (5662799).

28313965 is an equidigital number, since it uses as much as digits as its factorization.

28313965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5662798.

The product of its digits is 38880, while the sum is 37.

The square root of 28313965 is about 5321.0868250762. The cubic root of 28313965 is about 304.7896605832.

The spelling of 28313965 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred sixty-five".