2857808080 has 80 divisors (see below), whose sum is σ = 6728475600. Its totient is φ = 1128759296.

The previous prime is 2857808077. The next prime is 2857808111. The reversal of 2857808080 is 808087582.

It can be written as a sum of positive squares in 8 ways, for example, as 7529536 + 2850278544 = 2744^2 + 53388^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×2857808080² = 16334134044226572800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2857808080.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2347632 + ... + 2348848.

It is an arithmetic number, because the mean of its divisors is an integer number (84105945).

Almost surely, 2^2857808080 is an apocalyptic number.

2857808080 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 2857808080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3364237800).

2857808080 is an abundant number, since it is smaller than the sum of its proper divisors (3870667520).

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

2857808080 is a wasteful number, since it uses less digits than its factorization.

2857808080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 2857808080 is about 53458.4706103719. The cubic root of 2857808080 is about 1419.0935297813.

The spelling of 2857808080 in words is "two billion, eight hundred fifty-seven million, eight hundred eight thousand, eighty".