28317644 has 12 divisors (see below), whose sum is σ = 49686000. Its totient is φ = 14121648.

The previous prime is 28317637. The next prime is 28317647. The reversal of 28317644 is 44671382.

It is not an unprimeable number, because it can be changed into a prime (28317647) 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, 7544 + ... + 10655.

It is an arithmetic number, because the mean of its divisors is an integer number (4140500).

Almost surely, 2^28317644 is an apocalyptic number.

It is an amenable number.

28317644 is a deficient number, since it is larger than the sum of its proper divisors (21368356).

28317644 is a wasteful number, since it uses less digits than its factorization.

28317644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18592 (or 18590 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 28317644 is about 5321.4325139007. The cubic root of 28317644 is about 304.8028610492.

The spelling of 28317644 in words is "twenty-eight million, three hundred seventeen thousand, six hundred forty-four".