2091307788 has 24 divisors (see below), whose sum is σ = 5421909360. Its totient is φ = 697102560.

The previous prime is 2091307781. The next prime is 2091307807. The reversal of 2091307788 is 8877031902.

It is not an unprimeable number, because it can be changed into a prime (2091307781) 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, 9681873 + ... + 9682088.

It is an arithmetic number, because the mean of its divisors is an integer number (225912890).

Almost surely, 2^2091307788 is an apocalyptic number.

It is an amenable number.

2091307788 is an abundant number, since it is smaller than the sum of its proper divisors (3330601572).

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

2091307788 is a wasteful number, since it uses less digits than its factorization.

2091307788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19363974 (or 19363966 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 2091307788 is about 45730.8187987051. The cubic root of 2091307788 is about 1278.8098858273.

The spelling of 2091307788 in words is "two billion, ninety-one million, three hundred seven thousand, seven hundred eighty-eight".