6636629 has 4 divisors (see below), whose sum is σ = 6798540. Its totient is φ = 6474720.

The previous prime is 6636611. The next prime is 6636661. The reversal of 6636629 is 9266366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9266366 = 2 ⋅4633183.

It can be written as a sum of positive squares in 2 ways, for example, as 2235025 + 4401604 = 1495^2 + 2098^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6636629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6636592 and 6636601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6636689) 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, 80894 + ... + 80975.

It is an arithmetic number, because the mean of its divisors is an integer number (1699635).

Almost surely, 2^6636629 is an apocalyptic number.

It is an amenable number.

6636629 is a deficient number, since it is larger than the sum of its proper divisors (161911).

6636629 is a wasteful number, since it uses less digits than its factorization.

6636629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161910.

The product of its digits is 69984, while the sum is 38.

The square root of 6636629 is about 2576.1655614498. The cubic root of 6636629 is about 187.9241149145.

The spelling of 6636629 in words is "six million, six hundred thirty-six thousand, six hundred twenty-nine".