28726665 has 16 divisors (see below), whose sum is σ = 50141376. Its totient is φ = 13928000.

The previous prime is 28726661. The next prime is 28726667. The reversal of 28726665 is 56662782.

It is not a de Polignac number, because 28726665 - 2² = 28726661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28726661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86886 + ... + 87215.

It is an arithmetic number, because the mean of its divisors is an integer number (3133836).

Almost surely, 2^28726665 is an apocalyptic number.

It is an amenable number.

28726665 is a deficient number, since it is larger than the sum of its proper divisors (21414711).

28726665 is a wasteful number, since it uses less digits than its factorization.

28726665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174120.

The product of its digits is 241920, while the sum is 42.

The square root of 28726665 is about 5359.7262056937. The cubic root of 28726665 is about 306.2633791184.

The spelling of 28726665 in words is "twenty-eight million, seven hundred twenty-six thousand, six hundred sixty-five".