28571232 has 24 divisors (see below), whose sum is σ = 74999736. Its totient is φ = 9523712.

The previous prime is 28571227. The next prime is 28571239. The reversal of 28571232 is 23217582.

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 28571232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571239) 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, 148713 + ... + 148904.

It is an arithmetic number, because the mean of its divisors is an integer number (3124989).

Almost surely, 2^28571232 is an apocalyptic number.

It is an amenable number.

28571232 is an abundant number, since it is smaller than the sum of its proper divisors (46428504).

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

28571232 is a wasteful number, since it uses less digits than its factorization.

28571232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297630 (or 297622 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 28571232 is about 5345.2064506434. The cubic root of 28571232 is about 305.7100076347.

It can be divided in two parts, 285 and 71232, that added together give a palindrome (71517).

The spelling of 28571232 in words is "twenty-eight million, five hundred seventy-one thousand, two hundred thirty-two".