28647630 has 96 divisors (see below), whose sum is σ = 85587840. Its totient is φ = 6575040.

The previous prime is 28647629. The next prime is 28647631. The reversal of 28647630 is 3674682.

28647630 is a `hidden beast` number, since 2 + 8 + 647 + 6 + 3 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (28647629) and next prime (28647631).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28647631) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18049 + ... + 19571.

It is an arithmetic number, because the mean of its divisors is an integer number (891540).

Almost surely, 2^28647630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28647630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42793920).

28647630 is an abundant number, since it is smaller than the sum of its proper divisors (56940210).

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

28647630 is a wasteful number, since it uses less digits than its factorization.

28647630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566 (or 1563 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 28647630 is about 5352.3480828511. The cubic root of 28647630 is about 305.9822493868.

The spelling of 28647630 in words is "twenty-eight million, six hundred forty-seven thousand, six hundred thirty".