28332240 has 40 divisors (see below), whose sum is σ = 87830688. Its totient is φ = 7555200.

The previous prime is 28332229. The next prime is 28332257. The reversal of 28332240 is 4223382.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28332240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58786 + ... + 59265.

Almost surely, 2^28332240 is an apocalyptic number.

28332240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28332240 is an abundant number, since it is smaller than the sum of its proper divisors (59498448).

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

28332240 is a wasteful number, since it uses less digits than its factorization.

28332240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118067 (or 118061 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 28332240 is about 5322.8037724493. The cubic root of 28332240 is about 304.8552210831.

It can be divided in two parts, 283 and 32240, that added together give a palindrome (32523).

The spelling of 28332240 in words is "twenty-eight million, three hundred thirty-two thousand, two hundred forty".