28240472 has 64 divisors (see below), whose sum is σ = 60328800. Its totient is φ = 12303360.

The previous prime is 28240469. The next prime is 28240489. The reversal of 28240472 is 27404282.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157679 + ... + 157857.

Almost surely, 2^28240472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28240472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30164400).

28240472 is an abundant number, since it is smaller than the sum of its proper divisors (32088328).

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

28240472 is a wasteful number, since it uses less digits than its factorization.

28240472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 28240472 is about 5314.1765119348. The cubic root of 28240472 is about 304.5257235089.

The spelling of 28240472 in words is "twenty-eight million, two hundred forty thousand, four hundred seventy-two".