28241397 has 12 divisors (see below), whose sum is σ = 41896140. Its totient is φ = 18318528.

The previous prime is 28241393. The next prime is 28241413. The reversal of 28241397 is 79314282.

28241397 is a `hidden beast` number, since 28 + 241 + 397 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13793796 + 14447601 = 3714^2 + 3801^2 .

It is not a de Polignac number, because 28241397 - 2² = 28241393 is a prime.

It is a super-3 number, since 3×28241397³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28241393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42072 + ... + 42737.

It is an arithmetic number, because the mean of its divisors is an integer number (3491345).

Almost surely, 2^28241397 is an apocalyptic number.

It is an amenable number.

28241397 is a deficient number, since it is larger than the sum of its proper divisors (13654743).

28241397 is a wasteful number, since it uses less digits than its factorization.

28241397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84852 (or 84849 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28241397 is about 5314.2635425805. The cubic root of 28241397 is about 304.5290483260.

The spelling of 28241397 in words is "twenty-eight million, two hundred forty-one thousand, three hundred ninety-seven".