66986844 has 48 divisors (see below), whose sum is σ = 161914368. Its totient is φ = 21541248.

The previous prime is 66986831. The next prime is 66986849. The reversal of 66986844 is 44868966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66986849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40359 + ... + 41985.

It is an arithmetic number, because the mean of its divisors is an integer number (3373216).

Almost surely, 2^66986844 is an apocalyptic number.

It is an amenable number.

66986844 is an abundant number, since it is smaller than the sum of its proper divisors (94927524).

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

66986844 is a wasteful number, since it uses less digits than its factorization.

66986844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1754 (or 1752 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 51.

The square root of 66986844 is about 8184.5491018137. The cubic root of 66986844 is about 406.1282243607.

The spelling of 66986844 in words is "sixty-six million, nine hundred eighty-six thousand, eight hundred forty-four".