28482721 has 2 divisors, whose sum is σ = 28482722. Its totient is φ = 28482720.

The previous prime is 28482719. The next prime is 28482743. The reversal of 28482721 is 12728482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27248400 + 1234321 = 5220^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 28482721 - 2¹ = 28482719 is a prime.

It is a super-2 number, since 2×28482721² = 1622530791127682, which contains 22 as substring.

Together with 28482719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28482761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14241360 + 14241361.

It is an arithmetic number, because the mean of its divisors is an integer number (14241361).

Almost surely, 2^28482721 is an apocalyptic number.

It is an amenable number.

28482721 is a deficient number, since it is larger than the sum of its proper divisors (1).

28482721 is an equidigital number, since it uses as much as digits as its factorization.

28482721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 34.

The square root of 28482721 is about 5336.9205540274. The cubic root of 28482721 is about 305.3939940953.

The spelling of 28482721 in words is "twenty-eight million, four hundred eighty-two thousand, seven hundred twenty-one".