6636745 has 4 divisors (see below), whose sum is σ = 7964100. Its totient is φ = 5309392.

The previous prime is 6636709. The next prime is 6636767. The reversal of 6636745 is 5476366.

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

It can be written as a sum of positive squares in 2 ways, for example, as 891136 + 5745609 = 944^2 + 2397^2 .

It is a cyclic number.

It is not a de Polignac number, because 6636745 - 2¹³ = 6628553 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663670 + ... + 663679.

It is an arithmetic number, because the mean of its divisors is an integer number (1991025).

Almost surely, 2^6636745 is an apocalyptic number.

It is an amenable number.

6636745 is a deficient number, since it is larger than the sum of its proper divisors (1327355).

6636745 is a wasteful number, since it uses less digits than its factorization.

6636745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327354.

The product of its digits is 90720, while the sum is 37.

The square root of 6636745 is about 2576.1880754324. The cubic root of 6636745 is about 187.9252098012.

It can be divided in two parts, 6636 and 745, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 6636745 in words is "six million, six hundred thirty-six thousand, seven hundred forty-five".