2001780769 has 4 divisors (see below), whose sum is σ = 2007357120. Its totient is φ = 1996204420.

The previous prime is 2001780707. The next prime is 2001780799. The reversal of 2001780769 is 9670871002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001780769 - 2¹⁷ = 2001649697 is a prime.

It is a super-2 number, since 2×2001780769² = 8014252494276462722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001780799) 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, 2787637 + ... + 2788354.

It is an arithmetic number, because the mean of its divisors is an integer number (501839280).

Almost surely, 2^2001780769 is an apocalyptic number.

It is an amenable number.

2001780769 is a deficient number, since it is larger than the sum of its proper divisors (5576351).

2001780769 is an equidigital number, since it uses as much as digits as its factorization.

2001780769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5576350.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 2001780769 is about 44741.2647228484. The cubic root of 2001780769 is about 1260.2948770249.

The spelling of 2001780769 in words is "two billion, one million, seven hundred eighty thousand, seven hundred sixty-nine".