28278252 has 36 divisors (see below), whose sum is σ = 71654856. Its totient is φ = 9403200.

The previous prime is 28278227. The next prime is 28278253. The reversal of 28278252 is 25287282.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (28278253) 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, 20983 + ... + 22289.

Almost surely, 2^28278252 is an apocalyptic number.

It is an amenable number.

28278252 is an abundant number, since it is smaller than the sum of its proper divisors (43376604).

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

28278252 is a wasteful number, since it uses less digits than its factorization.

28278252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918 (or 1913 counting only the distinct ones).

The product of its digits is 35840, while the sum is 36.

The square root of 28278252 is about 5317.7299668185. The cubic root of 28278252 is about 304.6614607964.

The spelling of 28278252 in words is "twenty-eight million, two hundred seventy-eight thousand, two hundred fifty-two".