2821761965 has 8 divisors (see below), whose sum is σ = 3693943008. Its totient is φ = 2052190480.

The previous prime is 2821761961. The next prime is 2821761967. The reversal of 2821761965 is 5691671282.

It is a happy number.

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

It is not a de Polignac number, because 2821761965 - 2² = 2821761961 is a prime.

It is a super-3 number, since 3×2821761965³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821761961) 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, 25652327 + ... + 25652436.

It is an arithmetic number, because the mean of its divisors is an integer number (461742876).

Almost surely, 2^2821761965 is an apocalyptic number.

It is an amenable number.

2821761965 is a deficient number, since it is larger than the sum of its proper divisors (872181043).

2821761965 is a wasteful number, since it uses less digits than its factorization.

2821761965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51304779.

The product of its digits is 362880, while the sum is 47.

The square root of 2821761965 is about 53120.2594590802. The cubic root of 2821761965 is about 1413.1018286945.

The spelling of 2821761965 in words is "two billion, eight hundred twenty-one million, seven hundred sixty-one thousand, nine hundred sixty-five".