28621165 has 16 divisors (see below), whose sum is σ = 35786880. Its totient is φ = 21954240.

The previous prime is 28621121. The next prime is 28621169. The reversal of 28621165 is 56112682.

It is a de Polignac number, because none of the positive numbers 2^k-28621165 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28621169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12046 + ... + 14224.

It is an arithmetic number, because the mean of its divisors is an integer number (2236680).

Almost surely, 2^28621165 is an apocalyptic number.

It is an amenable number.

28621165 is a deficient number, since it is larger than the sum of its proper divisors (7165715).

28621165 is a wasteful number, since it uses less digits than its factorization.

28621165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292.

The product of its digits is 5760, while the sum is 31.

The square root of 28621165 is about 5349.8752321900. The cubic root of 28621165 is about 305.8879970859.

The spelling of 28621165 in words is "twenty-eight million, six hundred twenty-one thousand, one hundred sixty-five".