28647872 has 28 divisors (see below), whose sum is σ = 62017656. Its totient is φ = 13021440.

The previous prime is 28647869. The next prime is 28647893. The reversal of 28647872 is 27874682.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19643 + ... + 21050.

Almost surely, 2^28647872 is an apocalyptic number.

28647872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28647872 is an abundant number, since it is smaller than the sum of its proper divisors (33369784).

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

28647872 is a wasteful number, since it uses less digits than its factorization.

28647872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40716 (or 40706 counting only the distinct ones).

The product of its digits is 301056, while the sum is 44.

The square root of 28647872 is about 5352.3706897038. The cubic root of 28647872 is about 305.9831109764.

The spelling of 28647872 in words is "twenty-eight million, six hundred forty-seven thousand, eight hundred seventy-two".