28838870640 has 240 divisors, whose sum is σ = 100639558656. Its totient is φ = 7674912000.

The previous prime is 28838870639. The next prime is 28838870647. The reversal of 28838870640 is 4607883882.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28838870647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12265465 + ... + 12267815.

Almost surely, 2^28838870640 is an apocalyptic number.

28838870640 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 28838870640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50319779328).

28838870640 is an abundant number, since it is smaller than the sum of its proper divisors (71800688016).

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

28838870640 is a wasteful number, since it uses less digits than its factorization.

28838870640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3010 (or 2992 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 28838870640 in words is "twenty-eight billion, eight hundred thirty-eight million, eight hundred seventy thousand, six hundred forty".