28742268 has 12 divisors (see below), whose sum is σ = 67065320. Its totient is φ = 9580752.

The previous prime is 28742267. The next prime is 28742293. The reversal of 28742268 is 86224782.

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

It is a super-2 number, since 2×28742268² = 1652235939567648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742267) 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, 1197583 + ... + 1197606.

Almost surely, 2^28742268 is an apocalyptic number.

It is an amenable number.

28742268 is an abundant number, since it is smaller than the sum of its proper divisors (38323052).

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

28742268 is a wasteful number, since it uses less digits than its factorization.

28742268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395196 (or 2395194 counting only the distinct ones).

The product of its digits is 86016, while the sum is 39.

The square root of 28742268 is about 5361.1815861804. The cubic root of 28742268 is about 306.3188184647.

The spelling of 28742268 in words is "twenty-eight million, seven hundred forty-two thousand, two hundred sixty-eight".