2557705220 has 96 divisors (see below), whose sum is σ = 6471843840. Its totient is φ = 830517120.

The previous prime is 2557705201. The next prime is 2557705247. The reversal of 2557705220 is 225077552.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197711 + ... + 210249.

It is an arithmetic number, because the mean of its divisors is an integer number (67415040).

Almost surely, 2^2557705220 is an apocalyptic number.

2557705220 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 2557705220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3235921920).

2557705220 is an abundant number, since it is smaller than the sum of its proper divisors (3914138620).

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

2557705220 is a wasteful number, since it uses less digits than its factorization.

2557705220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12633 (or 12631 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 35.

The square root of 2557705220 is about 50573.7601924160. The cubic root of 2557705220 is about 1367.5718832078.

The spelling of 2557705220 in words is "two billion, five hundred fifty-seven million, seven hundred five thousand, two hundred twenty".