28922261 has 4 divisors (see below), whose sum is σ = 29627724. Its totient is φ = 28216800.

The previous prime is 28922233. The next prime is 28922269. The reversal of 28922261 is 16222982.

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 2193361 + 26728900 = 1481^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 28922261 - 2¹⁰ = 28921237 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 (28922269) 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 3 ways as a sum of consecutive naturals, for example, 352670 + ... + 352751.

It is an arithmetic number, because the mean of its divisors is an integer number (7406931).

Almost surely, 2^28922261 is an apocalyptic number.

It is an amenable number.

28922261 is a deficient number, since it is larger than the sum of its proper divisors (705463).

28922261 is an equidigital number, since it uses as much as digits as its factorization.

28922261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705462.

The product of its digits is 6912, while the sum is 32.

The square root of 28922261 is about 5377.9420785278. The cubic root of 28922261 is about 306.9569094985.

The spelling of 28922261 in words is "twenty-eight million, nine hundred twenty-two thousand, two hundred sixty-one".