2639000000 has 392 divisors, whose sum is σ = 8334268320. Its totient is φ = 806400000.

The previous prime is 2638999997. The next prime is 2639000011. The reversal of 2639000000 is 9362.

It is a happy number.

2639000000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 90999986 + ... + 91000014.

Almost surely, 2^2639000000 is an apocalyptic number.

2639000000 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 2639000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4167134160).

2639000000 is an abundant number, since it is smaller than the sum of its proper divisors (5695268320).

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

2639000000 is an frugal number, since it uses more digits than its factorization.

2639000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 2639000000 is about 51371.1981561653. The cubic root of 2639000000 is about 1381.9101183269.

Adding to 2639000000 its reverse (9362), we get a palindrome (2639009362).

The spelling of 2639000000 in words is "two billion, six hundred thirty-nine million", and thus it is an aban number.