2639155680 has 432 divisors, whose sum is σ = 10601149104. Its totient is φ = 596090880.

The previous prime is 2639155669. The next prime is 2639155693. The reversal of 2639155680 is 865519362.

2639155680 is a `hidden beast` number, since 2 + 6 + 3 + 91 + 556 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7973115 + ... + 7973445.

It is an arithmetic number, because the mean of its divisors is an integer number (24539697).

Almost surely, 2^2639155680 is an apocalyptic number.

2639155680 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 2639155680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5300574552).

2639155680 is an abundant number, since it is smaller than the sum of its proper divisors (7961993424).

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

2639155680 is a wasteful number, since it uses less digits than its factorization.

2639155680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 2639155680 is about 51372.7133797700. The cubic root of 2639155680 is about 1381.9372916927.

The spelling of 2639155680 in words is "two billion, six hundred thirty-nine million, one hundred fifty-five thousand, six hundred eighty".