28947424 has 24 divisors (see below), whose sum is σ = 62171928. Its totient is φ = 13157760.

The previous prime is 28947421. The next prime is 28947433. The reversal of 28947424 is 42474982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28947421) 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, 40767 + ... + 41470.

It is an arithmetic number, because the mean of its divisors is an integer number (2590497).

Almost surely, 2^28947424 is an apocalyptic number.

It is an amenable number.

28947424 is an abundant number, since it is smaller than the sum of its proper divisors (33224504).

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

28947424 is a wasteful number, since it uses less digits than its factorization.

28947424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82258 (or 82250 counting only the distinct ones).

The product of its digits is 129024, while the sum is 40.

The square root of 28947424 is about 5380.2810335521. The cubic root of 28947424 is about 307.0459034375.

The spelling of 28947424 in words is "twenty-eight million, nine hundred forty-seven thousand, four hundred twenty-four".