6636739 has 4 divisors (see below), whose sum is σ = 6745600. Its totient is φ = 6527880.

The previous prime is 6636709. The next prime is 6636767. The reversal of 6636739 is 9376366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9376366 = 2 ⋅4688183.

It is a cyclic number.

It is not a de Polignac number, because 6636739 - 2⁷ = 6636611 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6636709) 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, 54339 + ... + 54460.

It is an arithmetic number, because the mean of its divisors is an integer number (1686400).

Almost surely, 2^6636739 is an apocalyptic number.

6636739 is a deficient number, since it is larger than the sum of its proper divisors (108861).

6636739 is a wasteful number, since it uses less digits than its factorization.

6636739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108860.

The product of its digits is 122472, while the sum is 40.

The square root of 6636739 is about 2576.1869109209. The cubic root of 6636739 is about 187.9251531695.

The spelling of 6636739 in words is "six million, six hundred thirty-six thousand, seven hundred thirty-nine".