2865139220 has 18 divisors (see below), whose sum is σ = 6017295102. Its totient is φ = 1145959936.

The previous prime is 2865139213. The next prime is 2865139237. The reversal of 2865139220 is 229315682.

It can be written as a sum of positive squares in 3 ways, for example, as 77510416 + 2787628804 = 8804^2 + 52798^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 233396 + ... + 245364.

Almost surely, 2^2865139220 is an apocalyptic number.

2865139220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2865139220 is an abundant number, since it is smaller than the sum of its proper divisors (3152155882).

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

2865139220 is an frugal number, since it uses more digits than its factorization.

2865139220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23947 (or 11976 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 2865139220 is about 53526.9952453900. The cubic root of 2865139220 is about 1420.3059613144.

The spelling of 2865139220 in words is "two billion, eight hundred sixty-five million, one hundred thirty-nine thousand, two hundred twenty".