28865941 has 4 divisors (see below), whose sum is σ = 31086412. Its totient is φ = 26645472.

The previous prime is 28865911. The next prime is 28865987. The reversal of 28865941 is 14956882.

It is a happy number.

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 6502500 + 22363441 = 2550^2 + 4729^2 .

It is a cyclic number.

It is not a de Polignac number, because 28865941 - 2¹¹ = 28863893 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 (28865911) 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, 1110216 + ... + 1110241.

It is an arithmetic number, because the mean of its divisors is an integer number (7771603).

Almost surely, 2^28865941 is an apocalyptic number.

It is an amenable number.

28865941 is a deficient number, since it is larger than the sum of its proper divisors (2220471).

28865941 is a wasteful number, since it uses less digits than its factorization.

28865941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220470.

The product of its digits is 138240, while the sum is 43.

The square root of 28865941 is about 5372.7033232815. The cubic root of 28865941 is about 306.7575354275.

The spelling of 28865941 in words is "twenty-eight million, eight hundred sixty-five thousand, nine hundred forty-one".