28647280 has 40 divisors (see below), whose sum is σ = 66839472. Its totient is φ = 11418624.

The previous prime is 28647221. The next prime is 28647341. The reversal of 28647280 is 8274682.

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, 34227 + ... + 35053.

Almost surely, 2^28647280 is an apocalyptic number.

28647280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28647280 is an abundant number, since it is smaller than the sum of its proper divisors (38192192).

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

28647280 is a wasteful number, since it uses less digits than its factorization.

28647280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1267 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28647280 is about 5352.3153868209. The cubic root of 28647280 is about 305.9810032777.

The spelling of 28647280 in words is "twenty-eight million, six hundred forty-seven thousand, two hundred eighty".