66732739 has 4 divisors (see below), whose sum is σ = 68885440. Its totient is φ = 64580040.

The previous prime is 66732733. The next prime is 66732751. The reversal of 66732739 is 93723766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66732739 - 2¹¹ = 66730691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66732695 and 66732704.

It is not an unprimeable number, because it can be changed into a prime (66732733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076304 + ... + 1076365.

It is an arithmetic number, because the mean of its divisors is an integer number (17221360).

Almost surely, 2^66732739 is an apocalyptic number.

66732739 is a deficient number, since it is larger than the sum of its proper divisors (2152701).

66732739 is a wasteful number, since it uses less digits than its factorization.

66732739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152700.

The product of its digits is 285768, while the sum is 43.

The square root of 66732739 is about 8169.0108948391. The cubic root of 66732739 is about 405.6140439015.

The spelling of 66732739 in words is "sixty-six million, seven hundred thirty-two thousand, seven hundred thirty-nine".