28253808 has 60 divisors (see below), whose sum is σ = 86264568. Its totient is φ = 8561280.

The previous prime is 28253807. The next prime is 28253831. The reversal of 28253808 is 80835282.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28253807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7335 + ... + 10502.

Almost surely, 2^28253808 is an apocalyptic number.

It is an amenable number.

28253808 is an abundant number, since it is smaller than the sum of its proper divisors (58010760).

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

28253808 is a wasteful number, since it uses less digits than its factorization.

28253808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17862 (or 17853 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28253808 is about 5315.4311208029. The cubic root of 28253808 is about 304.5736513663.

The spelling of 28253808 in words is "twenty-eight million, two hundred fifty-three thousand, eight hundred eight".