2888781861 has 32 divisors (see below), whose sum is σ = 4471767040. Its totient is φ = 1624686336.

The previous prime is 2888781859. The next prime is 2888781887. The reversal of 2888781861 is 1681878882.

It is not a de Polignac number, because 2888781861 - 2¹ = 2888781859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2888781811) 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, 556500 + ... + 561666.

It is an arithmetic number, because the mean of its divisors is an integer number (139742720).

Almost surely, 2^2888781861 is an apocalyptic number.

2888781861 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2888781861 is a deficient number, since it is larger than the sum of its proper divisors (1582985179).

2888781861 is a wasteful number, since it uses less digits than its factorization.

2888781861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593.

The product of its digits is 2752512, while the sum is 57.

The square root of 2888781861 is about 53747.3893412508. The cubic root of 2888781861 is about 1424.2019721319.

The spelling of 2888781861 in words is "two billion, eight hundred eighty-eight million, seven hundred eighty-one thousand, eight hundred sixty-one".