28470816 has 216 divisors, whose sum is σ = 95855760. Its totient is φ = 7983360.

The previous prime is 28470811. The next prime is 28470817. The reversal of 28470816 is 61807482.

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

It is not an unprimeable number, because it can be changed into a prime (28470811) 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 35 ways as a sum of consecutive naturals, for example, 662091 + ... + 662133.

Almost surely, 2^28470816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28470816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47927880).

28470816 is an abundant number, since it is smaller than the sum of its proper divisors (67384944).

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

28470816 is a wasteful number, since it uses less digits than its factorization.

28470816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 78 counting only the distinct ones).

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

The square root of 28470816 is about 5335.8050938916. The cubic root of 28470816 is about 305.3514393811.

The spelling of 28470816 in words is "twenty-eight million, four hundred seventy thousand, eight hundred sixteen".