28661567 has 8 divisors (see below), whose sum is σ = 31307472. Its totient is φ = 26022400.

The previous prime is 28661561. The next prime is 28661579. The reversal of 28661567 is 76516682.

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

It is a cyclic number.

It is not a de Polignac number, because 28661567 - 2¹⁰ = 28660543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12317 + ... + 14457.

It is an arithmetic number, because the mean of its divisors is an integer number (3913434).

Almost surely, 2^28661567 is an apocalyptic number.

28661567 is a deficient number, since it is larger than the sum of its proper divisors (2645905).

28661567 is a wasteful number, since it uses less digits than its factorization.

28661567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369.

The product of its digits is 120960, while the sum is 41.

The square root of 28661567 is about 5353.6498764861. The cubic root of 28661567 is about 306.0318612075.

It can be divided in two parts, 286615 and 67, that added together give a palindrome (286682).

The spelling of 28661567 in words is "twenty-eight million, six hundred sixty-one thousand, five hundred sixty-seven".