28427972 has 12 divisors (see below), whose sum is σ = 49898940. Its totient is φ = 14171136.

The previous prime is 28427969. The next prime is 28427989. The reversal of 28427972 is 27972482.

It can be written as a sum of positive squares in 2 ways, for example, as 20214016 + 8213956 = 4496^2 + 2866^2 .

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, 9197 + ... + 11892.

It is an arithmetic number, because the mean of its divisors is an integer number (4158245).

Almost surely, 2^28427972 is an apocalyptic number.

It is an amenable number.

28427972 is a deficient number, since it is larger than the sum of its proper divisors (21470968).

28427972 is a wasteful number, since it uses less digits than its factorization.

28427972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21430 (or 21428 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 28427972 is about 5331.7888180235. The cubic root of 28427972 is about 305.1981942136.

The spelling of 28427972 in words is "twenty-eight million, four hundred twenty-seven thousand, nine hundred seventy-two".