2861780797 has 4 divisors (see below), whose sum is σ = 2862248796. Its totient is φ = 2861312800.

The previous prime is 2861780783. The next prime is 2861780809. The reversal of 2861780797 is 7970871682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7970871682 = 2 ⋅3985435841.

It can be written as a sum of positive squares in 2 ways, for example, as 333099001 + 2528681796 = 18251^2 + 50286^2 .

It is a cyclic number.

It is not a de Polignac number, because 2861780797 - 2²³ = 2853392189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2861780707) 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, 224704 + ... + 237097.

It is an arithmetic number, because the mean of its divisors is an integer number (715562199).

Almost surely, 2^2861780797 is an apocalyptic number.

It is an amenable number.

2861780797 is a deficient number, since it is larger than the sum of its proper divisors (467999).

2861780797 is an equidigital number, since it uses as much as digits as its factorization.

2861780797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467998.

The product of its (nonzero) digits is 2370816, while the sum is 55.

The square root of 2861780797 is about 53495.6147455097. The cubic root of 2861780797 is about 1419.7507988601.

The spelling of 2861780797 in words is "two billion, eight hundred sixty-one million, seven hundred eighty thousand, seven hundred ninety-seven".