28652215 has 24 divisors (see below), whose sum is σ = 36462960. Its totient is φ = 21605760.

The previous prime is 28652207. The next prime is 28652269. The reversal of 28652215 is 51225682.

It is not a de Polignac number, because 28652215 - 2³ = 28652207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

Its product of digits (9600) is a multiple of the sum of its prime divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 321891 + ... + 321979.

It is an arithmetic number, because the mean of its divisors is an integer number (1519290).

Almost surely, 2^28652215 is an apocalyptic number.

28652215 is a deficient number, since it is larger than the sum of its proper divisors (7810745).

28652215 is an equidigital number, since it uses as much as digits as its factorization.

28652215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223 (or 192 counting only the distinct ones).

The product of its digits is 9600, while the sum is 31.

The square root of 28652215 is about 5352.7763824019. The cubic root of 28652215 is about 305.9985724797.

Adding to 28652215 its reverse (51225682), we get a palindrome (79877897).

The spelling of 28652215 in words is "twenty-eight million, six hundred fifty-two thousand, two hundred fifteen".