2801221640 has 64 divisors (see below), whose sum is σ = 7209129600. Its totient is φ = 959620608.

The previous prime is 2801221637. The next prime is 2801221651. The reversal of 2801221640 is 461221082.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405092 + ... + 411948.

It is an arithmetic number, because the mean of its divisors is an integer number (112642650).

Almost surely, 2^2801221640 is an apocalyptic number.

2801221640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2801221640 is an abundant number, since it is smaller than the sum of its proper divisors (4407907960).

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

2801221640 is a wasteful number, since it uses less digits than its factorization.

2801221640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8334 (or 8330 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 2801221640 is about 52926.5683754388. The cubic root of 2801221640 is about 1409.6646990380.

The spelling of 2801221640 in words is "two billion, eight hundred one million, two hundred twenty-one thousand, six hundred forty".