28077142820 has 24 divisors (see below), whose sum is σ = 61525566144. Its totient is φ = 10742558816.

The previous prime is 28077142817. The next prime is 28077142867. The reversal of 28077142820 is 2824177082.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30518174 + ... + 30519093.

It is an arithmetic number, because the mean of its divisors is an integer number (2563565256).

Almost surely, 2^28077142820 is an apocalyptic number.

28077142820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28077142820 is an abundant number, since it is smaller than the sum of its proper divisors (33448423324).

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

28077142820 is a wasteful number, since it uses less digits than its factorization.

28077142820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61037299 (or 61037297 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 41.

The spelling of 28077142820 in words is "twenty-eight billion, seventy-seven million, one hundred forty-two thousand, eight hundred twenty".