28659481 has 4 divisors (see below), whose sum is σ = 28670992. Its totient is φ = 28647972.

The previous prime is 28659473. The next prime is 28659487. The reversal of 28659481 is 18495682.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28659481 - 2³ = 28659473 is a prime.

It is a super-2 number, since 2×28659481² = 1642731702378722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28659487) 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, 291 + ... + 7576.

It is an arithmetic number, because the mean of its divisors is an integer number (7167748).

Almost surely, 2^28659481 is an apocalyptic number.

It is an amenable number.

28659481 is a deficient number, since it is larger than the sum of its proper divisors (11511).

28659481 is an equidigital number, since it uses as much as digits as its factorization.

28659481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11510.

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

The square root of 28659481 is about 5353.4550525805. The cubic root of 28659481 is about 306.0244366547.

The spelling of 28659481 in words is "twenty-eight million, six hundred fifty-nine thousand, four hundred eighty-one".