28678140428 has 72 divisors (see below), whose sum is σ = 62028348480. Its totient is φ = 11534775840.

The previous prime is 28678140377. The next prime is 28678140473. The reversal of 28678140428 is 82404187682.

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 23 ways as a sum of consecutive naturals, for example, 362483 + ... + 434453.

It is an arithmetic number, because the mean of its divisors is an integer number (861504840).

Almost surely, 2^28678140428 is an apocalyptic number.

28678140428 is a gapful number since it is divisible by the number (28) 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 28678140428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31014174240).

28678140428 is an abundant number, since it is smaller than the sum of its proper divisors (33350208052).

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

28678140428 is a wasteful number, since it uses less digits than its factorization.

28678140428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72115 (or 72106 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 50.

The spelling of 28678140428 in words is "twenty-eight billion, six hundred seventy-eight million, one hundred forty thousand, four hundred twenty-eight".