66871240 has 16 divisors (see below), whose sum is σ = 150460380. Its totient is φ = 26748480.

The previous prime is 66871237. The next prime is 66871267. The reversal of 66871240 is 4217866.

It can be written as a sum of positive squares in 2 ways, for example, as 65318724 + 1552516 = 8082^2 + 1246^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66871196 and 66871205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835851 + ... + 835930.

Almost surely, 2^66871240 is an apocalyptic number.

It is an amenable number.

66871240 is an abundant number, since it is smaller than the sum of its proper divisors (83589140).

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

66871240 is a wasteful number, since it uses less digits than its factorization.

66871240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671792 (or 1671788 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66871240 is about 8177.4837205585. The cubic root of 66871240 is about 405.8944616359.

The spelling of 66871240 in words is "sixty-six million, eight hundred seventy-one thousand, two hundred forty".