28872216 has 48 divisors (see below), whose sum is σ = 78483600. Its totient is φ = 9588672.

The previous prime is 28872211. The next prime is 28872251. The reversal of 28872216 is 61227882.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28872211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25290 + ... + 26406.

It is an arithmetic number, because the mean of its divisors is an integer number (1635075).

Almost surely, 2^28872216 is an apocalyptic number.

It is an amenable number.

28872216 is an abundant number, since it is smaller than the sum of its proper divisors (49611384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28872216 is a wasteful number, since it uses less digits than its factorization.

28872216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1481 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28872216 is about 5373.2872620027. The cubic root of 28872216 is about 306.7797618993.

The spelling of 28872216 in words is "twenty-eight million, eight hundred seventy-two thousand, two hundred sixteen".