28380481 has 4 divisors (see below), whose sum is σ = 28550592. Its totient is φ = 28210372.

The previous prime is 28380479. The next prime is 28380523. The reversal of 28380481 is 18408382.

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 28380481 - 2¹ = 28380479 is a prime.

It is a super-2 number, since 2×28380481² = 1610903403582722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28380421) 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, 84805 + ... + 85138.

It is an arithmetic number, because the mean of its divisors is an integer number (7137648).

Almost surely, 2^28380481 is an apocalyptic number.

It is an amenable number.

28380481 is a deficient number, since it is larger than the sum of its proper divisors (170111).

28380481 is a wasteful number, since it uses less digits than its factorization.

28380481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170110.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 28380481 is about 5327.3333854753. Note that the first 4 decimals coincide. The cubic root of 28380481 is about 305.0281475411.

The spelling of 28380481 in words is "twenty-eight million, three hundred eighty thousand, four hundred eighty-one".