66284739 has 6 divisors (see below), whose sum is σ = 95744636. Its totient is φ = 44189820.

The previous prime is 66284707. The next prime is 66284759. The reversal of 66284739 is 93748266.

It is not a de Polignac number, because 66284739 - 2⁵ = 66284707 is a prime.

It is a super-3 number, since 3×66284739³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66284694 and 66284703.

It is not an unprimeable number, because it can be changed into a prime (66284759) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3682477 + ... + 3682494.

Almost surely, 2^66284739 is an apocalyptic number.

66284739 is a deficient number, since it is larger than the sum of its proper divisors (29459897).

66284739 is a wasteful number, since it uses less digits than its factorization.

66284739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7364977 (or 7364974 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 66284739 is about 8141.5440181823. The cubic root of 66284739 is about 404.7043292366.

The spelling of 66284739 in words is "sixty-six million, two hundred eighty-four thousand, seven hundred thirty-nine".