28972566 has 80 divisors (see below), whose sum is σ = 76839840. Its totient is φ = 7983360.

The previous prime is 28972553. The next prime is 28972577. The reversal of 28972566 is 66527982.

28972566 is a `hidden beast` number, since 2 + 89 + 7 + 2 + 566 = 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 39 ways as a sum of consecutive naturals, for example, 32446 + ... + 33326.

It is an arithmetic number, because the mean of its divisors is an integer number (960498).

Almost surely, 2^28972566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28972566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38419920).

28972566 is an abundant number, since it is smaller than the sum of its proper divisors (47867274).

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

28972566 is a wasteful number, since it uses less digits than its factorization.

28972566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 922 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 28972566 is about 5382.6170214869. The cubic root of 28972566 is about 307.1347716123.

The spelling of 28972566 in words is "twenty-eight million, nine hundred seventy-two thousand, five hundred sixty-six".