28630440 has 96 divisors (see below), whose sum is σ = 94517280. Its totient is φ = 7514496.

The previous prime is 28630429. The next prime is 28630451. The reversal of 28630440 is 4403682.

28630440 is a `hidden beast` number, since 28 + 630 + 4 + 4 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28630429) and next prime (28630451).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23527 + ... + 24713.

It is an arithmetic number, because the mean of its divisors is an integer number (984555).

Almost surely, 2^28630440 is an apocalyptic number.

28630440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28630440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47258640).

28630440 is an abundant number, since it is smaller than the sum of its proper divisors (65886840).

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

28630440 is a wasteful number, since it uses less digits than its factorization.

28630440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271 (or 1264 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 28630440 is about 5350.7420046195. The cubic root of 28630440 is about 305.9210356288.

The spelling of 28630440 in words is "twenty-eight million, six hundred thirty thousand, four hundred forty".