66772739 has 12 divisors (see below), whose sum is σ = 74277672. Its totient is φ = 59529600.

The previous prime is 66772733. The next prime is 66772801. The reversal of 66772739 is 93727766.

It is a happy number.

It is not a de Polignac number, because 66772739 - 2¹⁶ = 66707203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66772693 and 66772702.

It is not an unprimeable number, because it can be changed into a prime (66772733) 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 11 ways as a sum of consecutive naturals, for example, 29819 + ... + 31979.

It is an arithmetic number, because the mean of its divisors is an integer number (6189806).

Almost surely, 2^66772739 is an apocalyptic number.

66772739 is a deficient number, since it is larger than the sum of its proper divisors (7504933).

66772739 is a wasteful number, since it uses less digits than its factorization.

66772739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278 (or 2225 counting only the distinct ones).

The product of its digits is 666792, while the sum is 47.

The square root of 66772739 is about 8171.4588048891. The cubic root of 66772739 is about 405.6950702032.

It can be divided in two parts, 667727 and 39, that added together give a palindrome (667766).

The spelling of 66772739 in words is "sixty-six million, seven hundred seventy-two thousand, seven hundred thirty-nine".