28253643 has 16 divisors (see below), whose sum is σ = 43514496. Its totient is φ = 16115840.

The previous prime is 28253593. The next prime is 28253653. The reversal of 28253643 is 34635282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28253643 - 2¹⁷ = 28122571 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28253653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24621 + ... + 25742.

It is an arithmetic number, because the mean of its divisors is an integer number (2719656).

Almost surely, 2^28253643 is an apocalyptic number.

28253643 is a deficient number, since it is larger than the sum of its proper divisors (15260853).

28253643 is a wasteful number, since it uses less digits than its factorization.

28253643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50394.

The product of its digits is 34560, while the sum is 33.

The square root of 28253643 is about 5315.4155999320. The cubic root of 28253643 is about 304.5730584698.

The spelling of 28253643 in words is "twenty-eight million, two hundred fifty-three thousand, six hundred forty-three".