28444644 has 36 divisors (see below), whose sum is σ = 72124416. Its totient is φ = 9452208.

The previous prime is 28444597. The next prime is 28444657. The reversal of 28444644 is 44644482.

28444644 is a `hidden beast` number, since 2 + 8 + 4 + 4 + 4 + 644 = 666.

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 = 28444599 and 28444608.

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, 12757 + ... + 14819.

It is an arithmetic number, because the mean of its divisors is an integer number (2003456).

Almost surely, 2^28444644 is an apocalyptic number.

It is an amenable number.

28444644 is an abundant number, since it is smaller than the sum of its proper divisors (43679772).

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

28444644 is a wasteful number, since it uses less digits than its factorization.

28444644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456 (or 2451 counting only the distinct ones).

The product of its digits is 98304, while the sum is 36.

The square root of 28444644 is about 5333.3520416339. The cubic root of 28444644 is about 305.2578452024.

The spelling of 28444644 in words is "twenty-eight million, four hundred forty-four thousand, six hundred forty-four".