28216623 has 8 divisors (see below), whose sum is σ = 38919600. Its totient is φ = 18162368.

The previous prime is 28216613. The next prime is 28216627. The reversal of 28216623 is 32661282.

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 28216623 - 2¹⁰ = 28215599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28216627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162078 + ... + 162251.

It is an arithmetic number, because the mean of its divisors is an integer number (4864950).

Almost surely, 2^28216623 is an apocalyptic number.

28216623 is a deficient number, since it is larger than the sum of its proper divisors (10702977).

28216623 is a wasteful number, since it uses less digits than its factorization.

28216623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324361.

The product of its digits is 6912, while the sum is 30.

The square root of 28216623 is about 5311.9321343556. The cubic root of 28216623 is about 304.4399756578.

The spelling of 28216623 in words is "twenty-eight million, two hundred sixteen thousand, six hundred twenty-three".