28003996944 has 640 divisors, whose sum is σ = 107421696000. Its totient is φ = 6765120000.

The previous prime is 28003996921. The next prime is 28003996967. The reversal of 28003996944 is 44969930082.

It is an interprime number because it is at equal distance from previous prime (28003996921) and next prime (28003996967).

It is a super-2 number, since 2×28003996944² (a number of 22 digits) contains 22 as substring.

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

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 127 ways as a sum of consecutive naturals, for example, 37288569 + ... + 37289319.

It is an arithmetic number, because the mean of its divisors is an integer number (167846400).

Almost surely, 2^28003996944 is an apocalyptic number.

28003996944 is a gapful number since it is divisible by the number (24) 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 28003996944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53710848000).

28003996944 is an abundant number, since it is smaller than the sum of its proper divisors (79417699056).

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

28003996944 is a wasteful number, since it uses less digits than its factorization.

28003996944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 28003996944 in words is "twenty-eight billion, three million, nine hundred ninety-six thousand, nine hundred forty-four".