66071250 has 120 divisors (see below), whose sum is σ = 204684480. Its totient is φ = 15084000.

The previous prime is 66071191. The next prime is 66071267. The reversal of 66071250 is 5217066.

66071250 is a `hidden beast` number, since 6 + 607 + 1 + 2 + 50 = 666.

66071250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 59 ways as a sum of consecutive naturals, for example, 78331 + ... + 79169.

It is an arithmetic number, because the mean of its divisors is an integer number (1705704).

Almost surely, 2^66071250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66071250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102342240).

66071250 is an abundant number, since it is smaller than the sum of its proper divisors (138613230).

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

66071250 is a wasteful number, since it uses less digits than its factorization.

66071250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 856 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 66071250 is about 8128.4223561525. The cubic root of 66071250 is about 404.2693731730.

The spelling of 66071250 in words is "sixty-six million, seventy-one thousand, two hundred fifty".