28576644 has 12 divisors (see below), whose sum is σ = 66678864. Its totient is φ = 9525544.

The previous prime is 28576621. The next prime is 28576663. The reversal of 28576644 is 44667582.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 28576596 and 28576605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1190682 + ... + 1190705.

It is an arithmetic number, because the mean of its divisors is an integer number (5556572).

Almost surely, 2^28576644 is an apocalyptic number.

It is an amenable number.

28576644 is an abundant number, since it is smaller than the sum of its proper divisors (38102220).

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

28576644 is a wasteful number, since it uses less digits than its factorization.

28576644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381394 (or 2381392 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 28576644 is about 5345.7126746581. The cubic root of 28576644 is about 305.7293090787.

The spelling of 28576644 in words is "twenty-eight million, five hundred seventy-six thousand, six hundred forty-four".