28870215 has 32 divisors (see below), whose sum is σ = 53049600. Its totient is φ = 13259520.

The previous prime is 28870211. The next prime is 28870217. The reversal of 28870215 is 51207882.

It is not a de Polignac number, because 28870215 - 2² = 28870211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1470 + ... + 7739.

It is an arithmetic number, because the mean of its divisors is an integer number (1657800).

Almost surely, 2^28870215 is an apocalyptic number.

28870215 is a deficient number, since it is larger than the sum of its proper divisors (24179385).

28870215 is a wasteful number, since it uses less digits than its factorization.

28870215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9247.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 28870215 is about 5373.1010599094. The cubic root of 28870215 is about 306.7726745726.

The spelling of 28870215 in words is "twenty-eight million, eight hundred seventy thousand, two hundred fifteen".