66289344 has 56 divisors (see below), whose sum is σ = 191341248. Its totient is φ = 20087040.

The previous prime is 66289343. The next prime is 66289369. The reversal of 66289344 is 44398266.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66289296 and 66289305.

It is not an unprimeable number, because it can be changed into a prime (66289343) 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, 13582 + ... + 17805.

It is an arithmetic number, because the mean of its divisors is an integer number (3416808).

Almost surely, 2^66289344 is an apocalyptic number.

66289344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66289344 is an abundant number, since it is smaller than the sum of its proper divisors (125051904).

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

66289344 is a wasteful number, since it uses less digits than its factorization.

66289344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31413 (or 31403 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 66289344 is about 8141.8268220345. The cubic root of 66289344 is about 404.7137010282.

The spelling of 66289344 in words is "sixty-six million, two hundred eighty-nine thousand, three hundred forty-four".