28881699840 has 1056 divisors, whose sum is σ = 126915310080. Its totient is φ = 5917114368.

The previous prime is 28881699773. The next prime is 28881699853. The reversal of 28881699840 is 4899618882.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 126120846 + ... + 126121074.

Almost surely, 2^28881699840 is an apocalyptic number.

28881699840 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 28881699840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63457655040).

28881699840 is an abundant number, since it is smaller than the sum of its proper divisors (98033610240).

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

28881699840 is a wasteful number, since it uses less digits than its factorization.

28881699840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 63.

The spelling of 28881699840 in words is "twenty-eight billion, eight hundred eighty-one million, six hundred ninety-nine thousand, eight hundred forty".