66312782 has 8 divisors (see below), whose sum is σ = 102677952. Its totient is φ = 32086800.

The previous prime is 66312773. The next prime is 66312787. The reversal of 66312782 is 28721366.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66312787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 534719 + ... + 534842.

It is an arithmetic number, because the mean of its divisors is an integer number (12834744).

Almost surely, 2^66312782 is an apocalyptic number.

66312782 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

66312782 is a deficient number, since it is larger than the sum of its proper divisors (36365170).

66312782 is a wasteful number, since it uses less digits than its factorization.

66312782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069594.

The product of its digits is 24192, while the sum is 35.

The square root of 66312782 is about 8143.2660523895. The cubic root of 66312782 is about 404.7613937714.

The spelling of 66312782 in words is "sixty-six million, three hundred twelve thousand, seven hundred eighty-two".