2809640669 has 8 divisors (see below), whose sum is σ = 3170754720. Its totient is φ = 2466142000.

The previous prime is 2809640657. The next prime is 2809640689. The reversal of 2809640669 is 9660469082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2809640669 - 2⁴ = 2809640653 is a prime.

It is a super-2 number, since 2×2809640669² = 15788161377797535122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2809640689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4403507 + ... + 4404144.

It is an arithmetic number, because the mean of its divisors is an integer number (396344340).

Almost surely, 2^2809640669 is an apocalyptic number.

2809640669 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2809640669 is a deficient number, since it is larger than the sum of its proper divisors (361114051).

2809640669 is a wasteful number, since it uses less digits than its factorization.

2809640669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8807691.

The product of its (nonzero) digits is 1119744, while the sum is 50.

The square root of 2809640669 is about 53006.0437025817. The cubic root of 2809640669 is about 1411.0755285037.

The spelling of 2809640669 in words is "two billion, eight hundred nine million, six hundred forty thousand, six hundred sixty-nine".