28253436 has 24 divisors (see below), whose sum is σ = 66447360. Its totient is φ = 9343152.

The previous prime is 28253429. The next prime is 28253441. The reversal of 28253436 is 63435282.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28253397 and 28253406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7746 + ... + 10793.

It is an arithmetic number, because the mean of its divisors is an integer number (2768640).

Almost surely, 2^28253436 is an apocalyptic number.

It is an amenable number.

28253436 is an abundant number, since it is smaller than the sum of its proper divisors (38193924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28253436 is a wasteful number, since it uses less digits than its factorization.

28253436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18673 (or 18671 counting only the distinct ones).

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

The square root of 28253436 is about 5315.3961282298. The cubic root of 28253436 is about 304.5723146510.

The spelling of 28253436 in words is "twenty-eight million, two hundred fifty-three thousand, four hundred thirty-six".