28878855632 has 80 divisors (see below), whose sum is σ = 64087416000. Its totient is φ = 12484792320.

The previous prime is 28878855613. The next prime is 28878855673. The reversal of 28878855632 is 23655887882.

It is a super-2 number, since 2×28878855632² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 299744 + ... + 384192.

It is an arithmetic number, because the mean of its divisors is an integer number (801092700).

Almost surely, 2^28878855632 is an apocalyptic number.

28878855632 is a gapful number since it is divisible by the number (22) 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 28878855632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32043708000).

28878855632 is an abundant number, since it is smaller than the sum of its proper divisors (35208560368).

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

28878855632 is a wasteful number, since it uses less digits than its factorization.

28878855632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84564 (or 84558 counting only the distinct ones).

The product of its digits is 51609600, while the sum is 62.

The spelling of 28878855632 in words is "twenty-eight billion, eight hundred seventy-eight million, eight hundred fifty-five thousand, six hundred thirty-two".