28441381 has 4 divisors (see below), whose sum is σ = 28616032. Its totient is φ = 28266732.

The previous prime is 28441379. The next prime is 28441397. The reversal of 28441381 is 18314482.

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 not a de Polignac number, because 28441381 - 2¹ = 28441379 is a prime.

It is a super-2 number, since 2×28441381² = 1617824306374322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28441351) 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, 87081 + ... + 87406.

It is an arithmetic number, because the mean of its divisors is an integer number (7154008).

Almost surely, 2^28441381 is an apocalyptic number.

It is an amenable number.

28441381 is a deficient number, since it is larger than the sum of its proper divisors (174651).

28441381 is a wasteful number, since it uses less digits than its factorization.

28441381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174650.

The product of its digits is 6144, while the sum is 31.

The square root of 28441381 is about 5333.0461276835. The cubic root of 28441381 is about 305.2461723026.

It can be divided in two parts, 2844 and 1381, that added together give a square (4225 = 65²).

The spelling of 28441381 in words is "twenty-eight million, four hundred forty-one thousand, three hundred eighty-one".