66231860 has 12 divisors (see below), whose sum is σ = 139086948. Its totient is φ = 26492736.

The previous prime is 66231857. The next prime is 66231871. The reversal of 66231860 is 6813266.

66231860 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 2 ways, for example, as 19254544 + 46977316 = 4388^2 + 6854^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655777 + ... + 1655816.

It is an arithmetic number, because the mean of its divisors is an integer number (11590579).

Almost surely, 2^66231860 is an apocalyptic number.

It is an amenable number.

66231860 is an abundant number, since it is smaller than the sum of its proper divisors (72855088).

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

66231860 is a wasteful number, since it uses less digits than its factorization.

66231860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311602 (or 3311600 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66231860 is about 8138.2958904183. The cubic root of 66231860 is about 404.5966822688.

The spelling of 66231860 in words is "sixty-six million, two hundred thirty-one thousand, eight hundred sixty".