28680444 has 36 divisors (see below), whose sum is σ = 78075816. Its totient is φ = 8824608.

The previous prime is 28680437. The next prime is 28680461. The reversal of 28680444 is 44408682.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 28680399 and 28680408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30174 + ... + 31109.

Almost surely, 2^28680444 is an apocalyptic number.

It is an amenable number.

28680444 is an abundant number, since it is smaller than the sum of its proper divisors (49395372).

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

28680444 is a wasteful number, since it uses less digits than its factorization.

28680444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61306 (or 61301 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 28680444 is about 5355.4125891475. The cubic root of 28680444 is about 306.0990324085.

The spelling of 28680444 in words is "twenty-eight million, six hundred eighty thousand, four hundred forty-four".