2112777780 has 24 divisors (see below), whose sum is σ = 5915777952. Its totient is φ = 563407392.

The previous prime is 2112777767. The next prime is 2112777841. The reversal of 2112777780 is 877772112.

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, 17606422 + ... + 17606541.

It is an arithmetic number, because the mean of its divisors is an integer number (246490748).

Almost surely, 2^2112777780 is an apocalyptic number.

2112777780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2112777780 is an abundant number, since it is smaller than the sum of its proper divisors (3803000172).

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

2112777780 is a wasteful number, since it uses less digits than its factorization.

2112777780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35212975 (or 35212973 counting only the distinct ones).

The product of its (nonzero) digits is 76832, while the sum is 42.

The square root of 2112777780 is about 45964.9625258196. The cubic root of 2112777780 is about 1283.1712098941.

The spelling of 2112777780 in words is "two billion, one hundred twelve million, seven hundred seventy-seven thousand, seven hundred eighty".