28240493 has 2 divisors, whose sum is σ = 28240494. Its totient is φ = 28240492.

The previous prime is 28240489. The next prime is 28240529. The reversal of 28240493 is 39404282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26399044 + 1841449 = 5138^2 + 1357^2 .

It is a cyclic number.

It is not a de Polignac number, because 28240493 - 2² = 28240489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28240423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14120246 + 14120247.

It is an arithmetic number, because the mean of its divisors is an integer number (14120247).

Almost surely, 2^28240493 is an apocalyptic number.

It is an amenable number.

28240493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28240493 is an equidigital number, since it uses as much as digits as its factorization.

28240493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28240493 is about 5314.1784877815. The cubic root of 28240493 is about 304.5257989920.

The spelling of 28240493 in words is "twenty-eight million, two hundred forty thousand, four hundred ninety-three".