28427232 has 24 divisors (see below), whose sum is σ = 74621736. Its totient is φ = 9475712.

The previous prime is 28427219. The next prime is 28427233. The reversal of 28427232 is 23272482.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28427232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28427233) 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, 147963 + ... + 148154.

It is an arithmetic number, because the mean of its divisors is an integer number (3109239).

Almost surely, 2^28427232 is an apocalyptic number.

It is an amenable number.

28427232 is an abundant number, since it is smaller than the sum of its proper divisors (46194504).

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

28427232 is a wasteful number, since it uses less digits than its factorization.

28427232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296130 (or 296122 counting only the distinct ones).

The product of its digits is 10752, while the sum is 30.

The square root of 28427232 is about 5331.7194224753. The cubic root of 28427232 is about 305.1955460164.

The spelling of 28427232 in words is "twenty-eight million, four hundred twenty-seven thousand, two hundred thirty-two".