28120446 has 36 divisors (see below), whose sum is σ = 63297312. Its totient is φ = 9369108.

The previous prime is 28120423. The next prime is 28120447. The reversal of 28120446 is 64402182.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28120447) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 12051 + ... + 14193.

Almost surely, 2^28120446 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28120446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31648656).

28120446 is an abundant number, since it is smaller than the sum of its proper divisors (35176866).

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

28120446 is an frugal number, since it uses more digits than its factorization.

28120446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169 (or 2148 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28120446 is about 5302.8714862799. The cubic root of 28120446 is about 304.0936850569.

The spelling of 28120446 in words is "twenty-eight million, one hundred twenty thousand, four hundred forty-six".