28651865 has 8 divisors (see below), whose sum is σ = 37507968. Its totient is φ = 20837680.

The previous prime is 28651823. The next prime is 28651873. The reversal of 28651865 is 56815682.

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

It is not a de Polignac number, because 28651865 - 2²² = 24457561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260417 + ... + 260526.

It is an arithmetic number, because the mean of its divisors is an integer number (4688496).

Almost surely, 2^28651865 is an apocalyptic number.

It is an amenable number.

28651865 is a deficient number, since it is larger than the sum of its proper divisors (8856103).

28651865 is a wasteful number, since it uses less digits than its factorization.

28651865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520959.

The product of its digits is 115200, while the sum is 41.

The square root of 28651865 is about 5352.7436889879. The cubic root of 28651865 is about 305.9973265035.

The spelling of 28651865 in words is "twenty-eight million, six hundred fifty-one thousand, eight hundred sixty-five".