28147280 has 40 divisors (see below), whose sum is σ = 74792832. Its totient is φ = 9650304.

The previous prime is 28147271. The next prime is 28147297. The reversal of 28147280 is 8274182.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24572 + ... + 25691.

Almost surely, 2^28147280 is an apocalyptic number.

28147280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28147280 is an abundant number, since it is smaller than the sum of its proper divisors (46645552).

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

28147280 is a wasteful number, since it uses less digits than its factorization.

28147280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50283 (or 50277 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 28147280 is about 5305.4010216005. The cubic root of 28147280 is about 304.1903816709.

The spelling of 28147280 in words is "twenty-eight million, one hundred forty-seven thousand, two hundred eighty".