28541381 has 4 divisors (see below), whose sum is σ = 31136064. Its totient is φ = 25946700.

The previous prime is 28541369. The next prime is 28541407. The reversal of 28541381 is 18314582.

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-28541381 is a prime.

It is a super-2 number, since 2×28541381² = 1629220858774322, 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 (28541341) 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, 1297325 + ... + 1297346.

It is an arithmetic number, because the mean of its divisors is an integer number (7784016).

Almost surely, 2^28541381 is an apocalyptic number.

It is an amenable number.

28541381 is a deficient number, since it is larger than the sum of its proper divisors (2594683).

28541381 is a wasteful number, since it uses less digits than its factorization.

28541381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594682.

The product of its digits is 7680, while the sum is 32.

The square root of 28541381 is about 5342.4134059430. The cubic root of 28541381 is about 305.6035027250.

The spelling of 28541381 in words is "twenty-eight million, five hundred forty-one thousand, three hundred eighty-one".