28726663 has 4 divisors (see below), whose sum is σ = 32830480. Its totient is φ = 24622848.

The previous prime is 28726661. The next prime is 28726667. The reversal of 28726663 is 36662782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28726663 - 2¹ = 28726661 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 (28726661) 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, 2051898 + ... + 2051911.

It is an arithmetic number, because the mean of its divisors is an integer number (8207620).

Almost surely, 2^28726663 is an apocalyptic number.

28726663 is a deficient number, since it is larger than the sum of its proper divisors (4103817).

28726663 is an equidigital number, since it uses as much as digits as its factorization.

28726663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103816.

The product of its digits is 145152, while the sum is 40.

The square root of 28726663 is about 5359.7260191170. The cubic root of 28726663 is about 306.2633720109.

The spelling of 28726663 in words is "twenty-eight million, seven hundred twenty-six thousand, six hundred sixty-three".