66871380 has 24 divisors (see below), whose sum is σ = 187240032. Its totient is φ = 17832352.

The previous prime is 66871379. The next prime is 66871381. The reversal of 66871380 is 8317866.

66871380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66871379) and next prime (66871381).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66871381) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 557202 + ... + 557321.

It is an arithmetic number, because the mean of its divisors is an integer number (7801668).

Almost surely, 2^66871380 is an apocalyptic number.

66871380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66871380 is an abundant number, since it is smaller than the sum of its proper divisors (120368652).

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

66871380 is a wasteful number, since it uses less digits than its factorization.

66871380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114535 (or 1114533 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 66871380 is about 8177.4922806445. The cubic root of 66871380 is about 405.8947448927.

The spelling of 66871380 in words is "sixty-six million, eight hundred seventy-one thousand, three hundred eighty".