2638999980 has 48 divisors (see below), whose sum is σ = 8210223840. Its totient is φ = 703733184.

The previous prime is 2638999963. The next prime is 2638999997. The reversal of 2638999980 is 899998362.

It is an interprime number because it is at equal distance from previous prime (2638999963) and next prime (2638999997).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2442979 + ... + 2444058.

It is an arithmetic number, because the mean of its divisors is an integer number (171046330).

Almost surely, 2^2638999980 is an apocalyptic number.

2638999980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2638999980 is an abundant number, since it is smaller than the sum of its proper divisors (5571223860).

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

2638999980 is a wasteful number, since it uses less digits than its factorization.

2638999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4887055 (or 4887047 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The square root of 2638999980 is about 51371.1979615037. The cubic root of 2638999980 is about 1381.9101148359.

The spelling of 2638999980 in words is "two billion, six hundred thirty-eight million, nine hundred ninety-nine thousand, nine hundred eighty".