2798887644 has 324 divisors, whose sum is σ = 9049655160. Its totient is φ = 725034240.

The previous prime is 2798887639. The next prime is 2798887649. The reversal of 2798887644 is 4467888972.

It is an interprime number because it is at equal distance from previous prime (2798887639) and next prime (2798887649).

It is a super-3 number, since 3×2798887644³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2798887649) by changing a digit.

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 107 ways as a sum of consecutive naturals, for example, 45883374 + ... + 45883434.

Almost surely, 2^2798887644 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 2798887644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4524827580).

2798887644 is an abundant number, since it is smaller than the sum of its proper divisors (6250767516).

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

2798887644 is a wasteful number, since it uses less digits than its factorization.

2798887644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 129 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 63.

The square root of 2798887644 is about 52904.5144009469. The cubic root of 2798887644 is about 1409.2730763335.

The spelling of 2798887644 in words is "two billion, seven hundred ninety-eight million, eight hundred eighty-seven thousand, six hundred forty-four".