28767215 has 8 divisors (see below), whose sum is σ = 35323728. Its totient is φ = 22478400.

The previous prime is 28767191. The next prime is 28767251. The reversal of 28767215 is 51276782.

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

It is a de Polignac number, because none of the positive numbers 2^k-28767215 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66686 + ... + 67115.

It is an arithmetic number, because the mean of its divisors is an integer number (4415466).

Almost surely, 2^28767215 is an apocalyptic number.

28767215 is a deficient number, since it is larger than the sum of its proper divisors (6556513).

28767215 is a wasteful number, since it uses less digits than its factorization.

28767215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133849.

The product of its digits is 47040, while the sum is 38.

The square root of 28767215 is about 5363.5077141736. The cubic root of 28767215 is about 306.4074165036.

It can be divided in two parts, 28767 and 215, that added together give a palindrome (28982).

The spelling of 28767215 in words is "twenty-eight million, seven hundred sixty-seven thousand, two hundred fifteen".