2002780789 has 4 divisors (see below), whose sum is σ = 2006625420. Its totient is φ = 1998936160.

The previous prime is 2002780781. The next prime is 2002780811. The reversal of 2002780789 is 9870872002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9870872002 = 2 ⋅4935436001.

It can be written as a sum of positive squares in 2 ways, for example, as 632522500 + 1370258289 = 25150^2 + 37017^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002780789 - 2³ = 2002780781 is a prime.

It is a super-2 number, since 2×2002780789² = 8022261777574925042, 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 (2002780781) 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, 1921534 + ... + 1922575.

It is an arithmetic number, because the mean of its divisors is an integer number (501656355).

Almost surely, 2^2002780789 is an apocalyptic number.

It is an amenable number.

2002780789 is a deficient number, since it is larger than the sum of its proper divisors (3844631).

2002780789 is an equidigital number, since it uses as much as digits as its factorization.

2002780789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3844630.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 2002780789 is about 44752.4389167786. The cubic root of 2002780789 is about 1260.5047085725.

The spelling of 2002780789 in words is "two billion, two million, seven hundred eighty thousand, seven hundred eighty-nine".