28687465 has 4 divisors (see below), whose sum is σ = 34424964. Its totient is φ = 22949968.

The previous prime is 28687447. The next prime is 28687481. The reversal of 28687465 is 56478682.

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 10188864 + 18498601 = 3192^2 + 4301^2 .

It is a cyclic number.

It is not a de Polignac number, because 28687465 - 2²¹ = 26590313 is a prime.

It is a Duffinian 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, 2868742 + ... + 2868751.

It is an arithmetic number, because the mean of its divisors is an integer number (8606241).

Almost surely, 2^28687465 is an apocalyptic number.

It is an amenable number.

28687465 is a deficient number, since it is larger than the sum of its proper divisors (5737499).

28687465 is an equidigital number, since it uses as much as digits as its factorization.

28687465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5737498.

The product of its digits is 645120, while the sum is 46.

The square root of 28687465 is about 5356.0680540859. The cubic root of 28687465 is about 306.1240081488.

The spelling of 28687465 in words is "twenty-eight million, six hundred eighty-seven thousand, four hundred sixty-five".