28966261 has 4 divisors (see below), whose sum is σ = 29024352. Its totient is φ = 28908172.

The previous prime is 28966247. The next prime is 28966297. The reversal of 28966261 is 16266982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28966261 is a prime.

It is a super-3 number, since 3×28966261³ (a number of 23 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28967261) 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, 28291 + ... + 29296.

It is an arithmetic number, because the mean of its divisors is an integer number (7256088).

Almost surely, 2^28966261 is an apocalyptic number.

It is an amenable number.

28966261 is a deficient number, since it is larger than the sum of its proper divisors (58091).

28966261 is an equidigital number, since it uses as much as digits as its factorization.

28966261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58090.

The product of its digits is 62208, while the sum is 40.

The square root of 28966261 is about 5382.0313079729. The cubic root of 28966261 is about 307.1124904743.

It can be divided in two parts, 28 and 966261, that added together give a square (966289 = 983²).

The spelling of 28966261 in words is "twenty-eight million, nine hundred sixty-six thousand, two hundred sixty-one".