2165710780 has 24 divisors (see below), whose sum is σ = 4550365008. Its totient is φ = 865832448.

The previous prime is 2165710777. The next prime is 2165710853. The reversal of 2165710780 is 870175612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12492 + ... + 66988.

It is an arithmetic number, because the mean of its divisors is an integer number (189598542).

Almost surely, 2^2165710780 is an apocalyptic number.

2165710780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165710780 is an abundant number, since it is smaller than the sum of its proper divisors (2384654228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2165710780 is a wasteful number, since it uses less digits than its factorization.

2165710780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56493 (or 56491 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 2165710780 is about 46537.1978099241. The cubic root of 2165710780 is about 1293.7990247084.

The spelling of 2165710780 in words is "two billion, one hundred sixty-five million, seven hundred ten thousand, seven hundred eighty".