28724461 has 2 divisors, whose sum is σ = 28724462. Its totient is φ = 28724460.

The previous prime is 28724459. The next prime is 28724467. The reversal of 28724461 is 16442782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15721225 + 13003236 = 3965^2 + 3606^2 .

It is a cyclic number.

It is not a de Polignac number, because 28724461 - 2¹ = 28724459 is a prime.

Together with 28724459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28724467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362230 + 14362231.

It is an arithmetic number, because the mean of its divisors is an integer number (14362231).

Almost surely, 2^28724461 is an apocalyptic number.

It is an amenable number.

28724461 is a deficient number, since it is larger than the sum of its proper divisors (1).

28724461 is an equidigital number, since it uses as much as digits as its factorization.

28724461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 34.

The square root of 28724461 is about 5359.5205942323. The cubic root of 28724461 is about 306.2555464218.

The spelling of 28724461 in words is "twenty-eight million, seven hundred twenty-four thousand, four hundred sixty-one".