28664761 has 4 divisors (see below), whose sum is σ = 28960372. Its totient is φ = 28369152.

The previous prime is 28664729. The next prime is 28664767. The reversal of 28664761 is 16746682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15848361 + 12816400 = 3981^2 + 3580^2 .

It is a cyclic number.

It is not a de Polignac number, because 28664761 - 2⁵ = 28664729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28664767) 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, 147660 + ... + 147853.

It is an arithmetic number, because the mean of its divisors is an integer number (7240093).

Almost surely, 2^28664761 is an apocalyptic number.

It is an amenable number.

28664761 is a deficient number, since it is larger than the sum of its proper divisors (295611).

28664761 is an equidigital number, since it uses as much as digits as its factorization.

28664761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295610.

The product of its digits is 96768, while the sum is 40.

The square root of 28664761 is about 5353.9481693419. The cubic root of 28664761 is about 306.0432286885.

The spelling of 28664761 in words is "twenty-eight million, six hundred sixty-four thousand, seven hundred sixty-one".