28461481 has 4 divisors (see below), whose sum is σ = 28473172. Its totient is φ = 28449792.

The previous prime is 28461479. The next prime is 28461491. The reversal of 28461481 is 18416482.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2298256 + 26163225 = 1516^2 + 5115^2 .

It is a cyclic number.

It is not a de Polignac number, because 28461481 - 2¹ = 28461479 is a prime.

It is a super-2 number, since 2×28461481² = 1620111801426722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28461491) 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, 660 + ... + 7573.

It is an arithmetic number, because the mean of its divisors is an integer number (7118293).

Almost surely, 2^28461481 is an apocalyptic number.

It is an amenable number.

28461481 is a deficient number, since it is larger than the sum of its proper divisors (11691).

28461481 is an equidigital number, since it uses as much as digits as its factorization.

28461481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11690.

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

The square root of 28461481 is about 5334.9302713344. The cubic root of 28461481 is about 305.3180628962.

The spelling of 28461481 in words is "twenty-eight million, four hundred sixty-one thousand, four hundred eighty-one".