28788215 has 8 divisors (see below), whose sum is σ = 34622640. Its totient is φ = 22979392.

The previous prime is 28788187. The next prime is 28788223. The reversal of 28788215 is 51288782.

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

It is a cyclic number.

It is not a de Polignac number, because 28788215 - 2⁸ = 28787959 is a prime.

It is a super-2 number, since 2×28788215² = 1657522645772450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3830 + ... + 8499.

It is an arithmetic number, because the mean of its divisors is an integer number (4327830).

Almost surely, 2^28788215 is an apocalyptic number.

28788215 is a deficient number, since it is larger than the sum of its proper divisors (5834425).

28788215 is a wasteful number, since it uses less digits than its factorization.

28788215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12801.

The product of its digits is 71680, while the sum is 41.

The square root of 28788215 is about 5365.4650311040. The cubic root of 28788215 is about 306.4819572687.

The spelling of 28788215 in words is "twenty-eight million, seven hundred eighty-eight thousand, two hundred fifteen".