2091766720 has 28 divisors (see below), whose sum is σ = 4981020264. Its totient is φ = 836706560.

The previous prime is 2091766711. The next prime is 2091766727. The reversal of 2091766720 is 276671902.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091766727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3268066 + ... + 3268705.

Almost surely, 2^2091766720 is an apocalyptic number.

2091766720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2091766720 is an abundant number, since it is smaller than the sum of its proper divisors (2889253544).

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

2091766720 is an equidigital number, since it uses as much as digits as its factorization.

2091766720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536788 (or 6536778 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 2091766720 is about 45735.8362774750. The cubic root of 2091766720 is about 1278.9034228087.

The spelling of 2091766720 in words is "two billion, ninety-one million, seven hundred sixty-six thousand, seven hundred twenty".