28561784 has 8 divisors (see below), whose sum is σ = 53553360. Its totient is φ = 14280888.

The previous prime is 28561783. The next prime is 28561787. The reversal of 28561784 is 48716582.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1785104 + ... + 1785119.

It is an arithmetic number, because the mean of its divisors is an integer number (6694170).

Almost surely, 2^28561784 is an apocalyptic number.

It is an amenable number.

28561784 is a deficient number, since it is larger than the sum of its proper divisors (24991576).

28561784 is a wasteful number, since it uses less digits than its factorization.

28561784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3570229 (or 3570225 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 28561784 is about 5344.3225950536. The cubic root of 28561784 is about 305.6763062927.

It can be divided in two parts, 28561 and 784, that multiplied together give a square (22391824 = 4732²).

The spelling of 28561784 in words is "twenty-eight million, five hundred sixty-one thousand, seven hundred eighty-four".