28961839920 has 320 divisors, whose sum is σ = 99217649664. Its totient is φ = 6944071680.

The previous prime is 28961839919. The next prime is 28961839927. The reversal of 28961839920 is 2993816982.

It is not an unprimeable number, because it can be changed into a prime (28961839927) 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 63 ways as a sum of consecutive naturals, for example, 45898005 + ... + 45898635.

Almost surely, 2^28961839920 is an apocalyptic number.

28961839920 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 28961839920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49608824832).

28961839920 is an abundant number, since it is smaller than the sum of its proper divisors (70255809744).

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

28961839920 is a wasteful number, since it uses less digits than its factorization.

28961839920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020 (or 1014 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 28961839920 in words is "twenty-eight billion, nine hundred sixty-one million, eight hundred thirty-nine thousand, nine hundred twenty".