28213493 has 8 divisors (see below), whose sum is σ = 35175360. Its totient is φ = 21984480.

The previous prime is 28213477. The next prime is 28213511. The reversal of 28213493 is 39431282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28213493 - 2⁴ = 28213477 is a prime.

It is a super-2 number, since 2×28213493² = 1592002374522098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28213403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183128 + ... + 183281.

It is an arithmetic number, because the mean of its divisors is an integer number (4396920).

Almost surely, 2^28213493 is an apocalyptic number.

It is an amenable number.

28213493 is a deficient number, since it is larger than the sum of its proper divisors (6961867).

28213493 is a wasteful number, since it uses less digits than its factorization.

28213493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366427.

The product of its digits is 10368, while the sum is 32.

The square root of 28213493 is about 5311.6375064569. The cubic root of 28213493 is about 304.4287183177.

The spelling of 28213493 in words is "twenty-eight million, two hundred thirteen thousand, four hundred ninety-three".