2557780860 has 96 divisors (see below), whose sum is σ = 7647897600. Its totient is φ = 637297920.

The previous prime is 2557780853. The next prime is 2557780861. The reversal of 2557780860 is 680877552.

2557780860 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2557780861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30231 + ... + 77649.

It is an arithmetic number, because the mean of its divisors is an integer number (79665600).

Almost surely, 2^2557780860 is an apocalyptic number.

2557780860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2557780860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3823948800).

2557780860 is an abundant number, since it is smaller than the sum of its proper divisors (5090116740).

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

2557780860 is a wasteful number, since it uses less digits than its factorization.

2557780860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47491 (or 47489 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 48.

The square root of 2557780860 is about 50574.5080055160. The cubic root of 2557780860 is about 1367.5853643180.

The spelling of 2557780860 in words is "two billion, five hundred fifty-seven million, seven hundred eighty thousand, eight hundred sixty".