28645470 has 96 divisors (see below), whose sum is σ = 87272640. Its totient is φ = 6382080.

The previous prime is 28645469. The next prime is 28645489. The reversal of 28645470 is 7454682.

28645470 is a `hidden beast` number, since 2 + 8 + 645 + 4 + 7 + 0 = 666.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25276 + ... + 26384.

It is an arithmetic number, because the mean of its divisors is an integer number (909090).

Almost surely, 2^28645470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28645470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43636320).

28645470 is an abundant number, since it is smaller than the sum of its proper divisors (58627170).

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

28645470 is a wasteful number, since it uses less digits than its factorization.

28645470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170 (or 1167 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 28645470 is about 5352.1462984489. The cubic root of 28645470 is about 305.9745589511.

The spelling of 28645470 in words is "twenty-eight million, six hundred forty-five thousand, four hundred seventy".