28481407 has 2 divisors, whose sum is σ = 28481408. Its totient is φ = 28481406.

The previous prime is 28481381. The next prime is 28481459. The reversal of 28481407 is 70418482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28481407 - 2¹⁹ = 27957119 is a prime.

It is a super-2 number, since 2×28481407² = 1622381089399298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28481207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14240703 + 14240704.

It is an arithmetic number, because the mean of its divisors is an integer number (14240704).

Almost surely, 2^28481407 is an apocalyptic number.

28481407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28481407 is an equidigital number, since it uses as much as digits as its factorization.

28481407 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28481407 is about 5336.7974479082. The cubic root of 28481407 is about 305.3892977524.

Adding to 28481407 its reverse (70418482), we get a palindrome (98899889).

The spelling of 28481407 in words is "twenty-eight million, four hundred eighty-one thousand, four hundred seven".