28444980 has 96 divisors (see below), whose sum is σ = 84446208. Its totient is φ = 7142400.

The previous prime is 28444979. The next prime is 28444981. The reversal of 28444980 is 8944482.

It is an interprime number because it is at equal distance from previous prime (28444979) and next prime (28444981).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28444981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76074 + ... + 76446.

It is an arithmetic number, because the mean of its divisors is an integer number (879648).

Almost surely, 2^28444980 is an apocalyptic number.

28444980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28444980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42223104).

28444980 is an abundant number, since it is smaller than the sum of its proper divisors (56001228).

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

28444980 is a wasteful number, since it uses less digits than its factorization.

28444980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28444980 is about 5333.3835414303. The cubic root of 28444980 is about 305.2590471420.

The spelling of 28444980 in words is "twenty-eight million, four hundred forty-four thousand, nine hundred eighty".