2138878488 has 128 divisors (see below), whose sum is σ = 5802451200. Its totient is φ = 654796800.

The previous prime is 2138878487. The next prime is 2138878513. The reversal of 2138878488 is 8848788312.

It is a super-2 number, since 2×2138878488² = 9149602372858332288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138878487) 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, 4355923 + ... + 4356413.

It is an arithmetic number, because the mean of its divisors is an integer number (45331650).

Almost surely, 2^2138878488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138878488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2901225600).

2138878488 is an abundant number, since it is smaller than the sum of its proper divisors (3663572712).

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

2138878488 is a wasteful number, since it uses less digits than its factorization.

2138878488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793 (or 789 counting only the distinct ones).

The product of its digits is 5505024, while the sum is 57.

The square root of 2138878488 is about 46248.0106382966. The cubic root of 2138878488 is about 1288.4335869677.

The spelling of 2138878488 in words is "two billion, one hundred thirty-eight million, eight hundred seventy-eight thousand, four hundred eighty-eight".