28315481 has 2 divisors, whose sum is σ = 28315482. Its totient is φ = 28315480.

The previous prime is 28315433. The next prime is 28315499. The reversal of 28315481 is 18451382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21939856 + 6375625 = 4684^2 + 2525^2 .

It is a cyclic number.

It is not a de Polignac number, because 28315481 - 2¹⁰ = 28314457 is a prime.

It is a super-2 number, since 2×28315481² = 1603532928522722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28315181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14157740 + 14157741.

It is an arithmetic number, because the mean of its divisors is an integer number (14157741).

Almost surely, 2^28315481 is an apocalyptic number.

It is an amenable number.

28315481 is a deficient number, since it is larger than the sum of its proper divisors (1).

28315481 is an equidigital number, since it uses as much as digits as its factorization.

28315481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 32.

The square root of 28315481 is about 5321.2292752709. The cubic root of 28315481 is about 304.7951002179.

The spelling of 28315481 in words is "twenty-eight million, three hundred fifteen thousand, four hundred eighty-one".