28684646 has 8 divisors (see below), whose sum is σ = 43470840. Its totient is φ = 14194368.

The previous prime is 28684637. The next prime is 28684651. The reversal of 28684646 is 64648682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28684646² = 1645617832290632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28684597 and 28684606.

It is a congruent number.

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, 73736 + ... + 74123.

It is an arithmetic number, because the mean of its divisors is an integer number (5433855).

Almost surely, 2^28684646 is an apocalyptic number.

28684646 is a deficient number, since it is larger than the sum of its proper divisors (14786194).

28684646 is a wasteful number, since it uses less digits than its factorization.

28684646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147958.

The product of its digits is 442368, while the sum is 44.

The square root of 28684646 is about 5355.8048881564. The cubic root of 28684646 is about 306.1139806351.

The spelling of 28684646 in words is "twenty-eight million, six hundred eighty-four thousand, six hundred forty-six".