28866085780 has 48 divisors (see below), whose sum is σ = 69951248640. Its totient is φ = 9800851968.

The previous prime is 28866085753. The next prime is 28866085841. The reversal of 28866085780 is 8758066882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 986485 + ... + 1015324.

It is an arithmetic number, because the mean of its divisors is an integer number (1457317680).

Almost surely, 2^28866085780 is an apocalyptic number.

28866085780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28866085780 is an abundant number, since it is smaller than the sum of its proper divisors (41085162860).

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

28866085780 is a wasteful number, since it uses less digits than its factorization.

28866085780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001928 (or 2001926 counting only the distinct ones).

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 28866085780 in words is "twenty-eight billion, eight hundred sixty-six million, eighty-five thousand, seven hundred eighty".