28142628 has 12 divisors (see below), whose sum is σ = 65666160. Its totient is φ = 9380872.

The previous prime is 28142623. The next prime is 28142641. The reversal of 28142628 is 82624182.

It is a happy number.

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

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28142623) 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, 1172598 + ... + 1172621.

It is an arithmetic number, because the mean of its divisors is an integer number (5472180).

Almost surely, 2^28142628 is an apocalyptic number.

It is an amenable number.

28142628 is an abundant number, since it is smaller than the sum of its proper divisors (37523532).

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

28142628 is a wasteful number, since it uses less digits than its factorization.

28142628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2345226 (or 2345224 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 28142628 is about 5304.9625823374. The cubic root of 28142628 is about 304.1736225427.

It can be divided in two parts, 2 and 8142628, that added together give a triangular number (8142630 = T₄₀₃₅).

The spelling of 28142628 in words is "twenty-eight million, one hundred forty-two thousand, six hundred twenty-eight".