28645293 has 8 divisors (see below), whose sum is σ = 40204000. Its totient is φ = 18091728.

The previous prime is 28645283. The next prime is 28645297. The reversal of 28645293 is 39254682.

It is a happy number.

28645293 is nontrivially palindromic in base 12.

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

It is not a de Polignac number, because 28645293 - 2⁶ = 28645229 is a prime.

It is a super-2 number, since 2×28645293² = 1641105622111698, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645297) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251218 + ... + 251331.

It is an arithmetic number, because the mean of its divisors is an integer number (5025500).

Almost surely, 2^28645293 is an apocalyptic number.

It is an amenable number.

28645293 is a deficient number, since it is larger than the sum of its proper divisors (11558707).

28645293 is a wasteful number, since it uses less digits than its factorization.

28645293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502571.

The product of its digits is 103680, while the sum is 39.

The square root of 28645293 is about 5352.1297630009. The cubic root of 28645293 is about 305.9739287455.

The spelling of 28645293 in words is "twenty-eight million, six hundred forty-five thousand, two hundred ninety-three".