2861381820 has 48 divisors (see below), whose sum is σ = 8740222848. Its totient is φ = 693668160.

The previous prime is 2861381807. The next prime is 2861381821. The reversal of 2861381820 is 281831682.

2861381820 is digitally balanced in base 2, because in such base 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 (2861381821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2167054 + ... + 2168373.

It is an arithmetic number, because the mean of its divisors is an integer number (182087976).

Almost surely, 2^2861381820 is an apocalyptic number.

2861381820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2861381820 is an abundant number, since it is smaller than the sum of its proper divisors (5878841028).

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

2861381820 is a wasteful number, since it uses less digits than its factorization.

2861381820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335450 (or 4335448 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 2861381820 is about 53491.8855528575. The cubic root of 2861381820 is about 1419.6848173052.

The spelling of 2861381820 in words is "two billion, eight hundred sixty-one million, three hundred eighty-one thousand, eight hundred twenty".