28061503878 has 32 divisors (see below), whose sum is σ = 59809176576. Its totient is φ = 8756779328.

The previous prime is 28061503837. The next prime is 28061503907. The reversal of 28061503878 is 87830516082.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2156751 + ... + 2169722.

It is an arithmetic number, because the mean of its divisors is an integer number (1869036768).

Almost surely, 2^28061503878 is an apocalyptic number.

28061503878 is an abundant number, since it is smaller than the sum of its proper divisors (31747672698).

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

28061503878 is a wasteful number, since it uses less digits than its factorization.

28061503878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4326548.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 28061503878 in words is "twenty-eight billion, sixty-one million, five hundred three thousand, eight hundred seventy-eight".