2188782765 has 48 divisors (see below), whose sum is σ = 4090020480. Its totient is φ = 1076423040.

The previous prime is 2188782727. The next prime is 2188782773. The reversal of 2188782765 is 5672878812.

It is not a de Polignac number, because 2188782765 - 2⁷ = 2188782637 is a prime.

It is a super-2 number, since 2×2188782765² = 9581539984722090450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 945960 + ... + 948270.

It is an arithmetic number, because the mean of its divisors is an integer number (85208760).

Almost surely, 2^2188782765 is an apocalyptic number.

It is an amenable number.

2188782765 is a deficient number, since it is larger than the sum of its proper divisors (1901237715).

2188782765 is a wasteful number, since it uses less digits than its factorization.

2188782765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3954 (or 3951 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The square root of 2188782765 is about 46784.4286595444. The cubic root of 2188782765 is about 1298.3772187257.

The spelling of 2188782765 in words is "two billion, one hundred eighty-eight million, seven hundred eighty-two thousand, seven hundred sixty-five".