66831384 has 32 divisors (see below), whose sum is σ = 167328000. Its totient is φ = 22243872.

The previous prime is 66831383. The next prime is 66831389. The reversal of 66831384 is 48313866.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66831383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18477 + ... + 21795.

It is an arithmetic number, because the mean of its divisors is an integer number (5229000).

Almost surely, 2^66831384 is an apocalyptic number.

It is an amenable number.

66831384 is an abundant number, since it is smaller than the sum of its proper divisors (100496616).

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

66831384 is a wasteful number, since it uses less digits than its factorization.

66831384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4167 (or 4163 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 66831384 is about 8175.0464218865. The cubic root of 66831384 is about 405.8138064112.

The spelling of 66831384 in words is "sixty-six million, eight hundred thirty-one thousand, three hundred eighty-four".