28290493 has 24 divisors (see below), whose sum is σ = 36443520. Its totient is φ = 21712320.

The previous prime is 28290463. The next prime is 28290511. The reversal of 28290493 is 39409282.

It is not a de Polignac number, because 28290493 - 2⁹ = 28289981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28290463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38988 + ... + 39706.

It is an arithmetic number, because the mean of its divisors is an integer number (1518480).

Almost surely, 2^28290493 is an apocalyptic number.

It is an amenable number.

28290493 is a deficient number, since it is larger than the sum of its proper divisors (8153027).

28290493 is a wasteful number, since it uses less digits than its factorization.

28290493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28290493 is about 5318.8808033270. The cubic root of 28290493 is about 304.7054147503.

It can be divided in two parts, 28 and 290493, that added together give a square (290521 = 539²).

The spelling of 28290493 in words is "twenty-eight million, two hundred ninety thousand, four hundred ninety-three".