28988215 has 4 divisors (see below), whose sum is σ = 34785864. Its totient is φ = 23190568.

The previous prime is 28988209. The next prime is 28988221. The reversal of 28988215 is 51288982.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28988209) and next prime (28988221).

It is a cyclic number.

It is not a de Polignac number, because 28988215 - 2³ = 28988207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2898817 + ... + 2898826.

It is an arithmetic number, because the mean of its divisors is an integer number (8696466).

Almost surely, 2^28988215 is an apocalyptic number.

28988215 is a deficient number, since it is larger than the sum of its proper divisors (5797649).

28988215 is an equidigital number, since it uses as much as digits as its factorization.

28988215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5797648.

The product of its digits is 92160, while the sum is 43.

The square root of 28988215 is about 5384.0704861656. The cubic root of 28988215 is about 307.1900593967.

The spelling of 28988215 in words is "twenty-eight million, nine hundred eighty-eight thousand, two hundred fifteen".