28332644 has 12 divisors (see below), whose sum is σ = 49655424. Its totient is φ = 14145384.

The previous prime is 28332641. The next prime is 28332653. The reversal of 28332644 is 44623382.

It is a self number, because there is not a number n which added to its sum of digits gives 28332644.

It is not an unprimeable number, because it can be changed into a prime (28332641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1964 + ... + 7779.

It is an arithmetic number, because the mean of its divisors is an integer number (4137952).

Almost surely, 2^28332644 is an apocalyptic number.

It is an amenable number.

28332644 is a deficient number, since it is larger than the sum of its proper divisors (21322780).

28332644 is a wasteful number, since it uses less digits than its factorization.

28332644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10474 (or 10472 counting only the distinct ones).

The product of its digits is 27648, while the sum is 32.

The square root of 28332644 is about 5322.8417222382. The cubic root of 28332644 is about 304.8566700911.

The spelling of 28332644 in words is "twenty-eight million, three hundred thirty-two thousand, six hundred forty-four".