28274028 has 12 divisors (see below), whose sum is σ = 65972760. Its totient is φ = 9424672.

The previous prime is 28274027. The next prime is 28274087. The reversal of 28274028 is 82047282.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 28274028.

It is not an unprimeable number, because it can be changed into a prime (28274023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178073 + ... + 1178096.

It is an arithmetic number, because the mean of its divisors is an integer number (5497730).

Almost surely, 2^28274028 is an apocalyptic number.

It is an amenable number.

28274028 is an abundant number, since it is smaller than the sum of its proper divisors (37698732).

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

28274028 is a wasteful number, since it uses less digits than its factorization.

28274028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356176 (or 2356174 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 28274028 is about 5317.3327900367. The cubic root of 28274028 is about 304.6462906686.

The spelling of 28274028 in words is "twenty-eight million, two hundred seventy-four thousand, twenty-eight".