28747008 has 72 divisors (see below), whose sum is σ = 85030400. Its totient is φ = 9580032.

The previous prime is 28747003. The next prime is 28747021. The reversal of 28747008 is 80074782.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28747001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4833 + ... + 8991.

Almost surely, 2^28747008 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 28747008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42515200).

28747008 is an abundant number, since it is smaller than the sum of its proper divisors (56283392).

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

28747008 is an equidigital number, since it uses as much as digits as its factorization.

28747008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4184 (or 4164 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28747008 is about 5361.6236346838. The cubic root of 28747008 is about 306.3356562846.

The spelling of 28747008 in words is "twenty-eight million, seven hundred forty-seven thousand, eight".