28838261 has 4 divisors (see below), whose sum is σ = 28867212. Its totient is φ = 28809312.

The previous prime is 28838237. The next prime is 28838263. The reversal of 28838261 is 16283882.

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 27615025 + 1223236 = 5255^2 + 1106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28838261 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 (28838263) 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, 12926 + ... + 14991.

It is an arithmetic number, because the mean of its divisors is an integer number (7216803).

Almost surely, 2^28838261 is an apocalyptic number.

It is an amenable number.

28838261 is a deficient number, since it is larger than the sum of its proper divisors (28951).

28838261 is a wasteful number, since it uses less digits than its factorization.

28838261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28950.

The product of its digits is 36864, while the sum is 38.

The square root of 28838261 is about 5370.1267210374. The cubic root of 28838261 is about 306.6594525451.

The spelling of 28838261 in words is "twenty-eight million, eight hundred thirty-eight thousand, two hundred sixty-one".