28870855 has 8 divisors (see below), whose sum is σ = 37310112. Its totient is φ = 21319968.

The previous prime is 28870837. The next prime is 28870859. The reversal of 28870855 is 55807882.

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 28870855 - 2¹³ = 28862663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28870859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222019 + ... + 222148.

It is an arithmetic number, because the mean of its divisors is an integer number (4663764).

Almost surely, 2^28870855 is an apocalyptic number.

28870855 is a deficient number, since it is larger than the sum of its proper divisors (8439257).

28870855 is a wasteful number, since it uses less digits than its factorization.

28870855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444185.

The product of its (nonzero) digits is 179200, while the sum is 43.

The square root of 28870855 is about 5373.1606155037. The cubic root of 28870855 is about 306.7749414193.

The spelling of 28870855 in words is "twenty-eight million, eight hundred seventy thousand, eight hundred fifty-five".