28000027780 has 24 divisors (see below), whose sum is σ = 59059099008. Its totient is φ = 11150670048.

The previous prime is 28000027777. The next prime is 28000027813. The reversal of 28000027780 is 8772000082.

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, 3079164 + ... + 3088243.

It is an arithmetic number, because the mean of its divisors is an integer number (2460795792).

Almost surely, 2^28000027780 is an apocalyptic number.

28000027780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28000027780 is an abundant number, since it is smaller than the sum of its proper divisors (31059071228).

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

28000027780 is a wasteful number, since it uses less digits than its factorization.

28000027780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6167643 (or 6167641 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The spelling of 28000027780 in words is "twenty-eight billion, twenty-seven thousand, seven hundred eighty".