28671570 has 144 divisors (see below), whose sum is σ = 85026240. Its totient is φ = 6928416.

The previous prime is 28671557. The next prime is 28671611. The reversal of 28671570 is 7517682.

28671570 is a `hidden beast` number, since 2 + 86 + 7 + 1 + 570 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1246579 + ... + 1246601.

It is an arithmetic number, because the mean of its divisors is an integer number (590460).

Almost surely, 2^28671570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28671570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42513120).

28671570 is an abundant number, since it is smaller than the sum of its proper divisors (56354670).

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

28671570 is an equidigital number, since it uses as much as digits as its factorization.

28671570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 28671570 is about 5354.5840174564. The cubic root of 28671570 is about 306.0674591756.

It can be divided in two parts, 28671 and 570, that added together give a square (29241 = 171²).

The spelling of 28671570 in words is "twenty-eight million, six hundred seventy-one thousand, five hundred seventy".