28307564 has 12 divisors (see below), whose sum is σ = 49584864. Its totient is φ = 14140464.

The previous prime is 28307527. The next prime is 28307569. The reversal of 28307564 is 46570382.

It is a happy number.

It is a super-2 number, since 2×28307564² = 1602636359228192, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28307569) 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, 2642 + ... + 7974.

It is an arithmetic number, because the mean of its divisors is an integer number (4132072).

Almost surely, 2^28307564 is an apocalyptic number.

It is an amenable number.

28307564 is a deficient number, since it is larger than the sum of its proper divisors (21277300).

28307564 is a wasteful number, since it uses less digits than its factorization.

28307564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6664 (or 6662 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 28307564 is about 5320.4853162094. The cubic root of 28307564 is about 304.7666906971.

The spelling of 28307564 in words is "twenty-eight million, three hundred seven thousand, five hundred sixty-four".