2649637980 has 192 divisors, whose sum is σ = 9105384960. Its totient is φ = 642219840.

The previous prime is 2649637979. The next prime is 2649637993. The reversal of 2649637980 is 897369462.

It is a happy number.

2649637980 is a `hidden beast` number, since 2 + 6 + 496 + 3 + 79 + 80 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 478387 + ... + 483893.

It is an arithmetic number, because the mean of its divisors is an integer number (47423880).

Almost surely, 2^2649637980 is an apocalyptic number.

2649637980 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 2649637980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4552692480).

2649637980 is an abundant number, since it is smaller than the sum of its proper divisors (6455746980).

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

2649637980 is a wasteful number, since it uses less digits than its factorization.

2649637980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5548 (or 5528 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The square root of 2649637980 is about 51474.6343357580. The cubic root of 2649637980 is about 1383.7644852737.

The spelling of 2649637980 in words is "two billion, six hundred forty-nine million, six hundred thirty-seven thousand, nine hundred eighty".