28331919616 has 648 divisors, whose sum is σ = 84187127360. Its totient is φ = 9233326080.

The previous prime is 28331919601. The next prime is 28331919709. The reversal of 28331919616 is 61691913382.

It is a self number, because there is not a number n which added to its sum of digits gives 28331919616.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1231822581 + ... + 1231822603.

Almost surely, 2^28331919616 is an apocalyptic number.

28331919616 is a gapful number since it is divisible by the number (26) 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 28331919616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42093563680).

28331919616 is an abundant number, since it is smaller than the sum of its proper divisors (55855207744).

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

28331919616 is a wasteful number, since it uses less digits than its factorization.

28331919616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 75 counting only the distinct ones).

The product of its digits is 419904, while the sum is 49.

The spelling of 28331919616 in words is "twenty-eight billion, three hundred thirty-one million, nine hundred nineteen thousand, six hundred sixteen".