2639298816 has 864 divisors, whose sum is σ = 10713830400. Its totient is φ = 627056640.

The previous prime is 2639298811. The next prime is 2639298817. The reversal of 2639298816 is 6188929362.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639298811) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 91010290 + ... + 91010318.

Almost surely, 2^2639298816 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 2639298816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5356915200).

2639298816 is an abundant number, since it is smaller than the sum of its proper divisors (8074531584).

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

2639298816 is a wasteful number, since it uses less digits than its factorization.

2639298816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 71 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 2639298816 is about 51374.1064739816. The cubic root of 2639298816 is about 1381.9622746070.

The spelling of 2639298816 in words is "two billion, six hundred thirty-nine million, two hundred ninety-eight thousand, eight hundred sixteen".