28771920061880 has 64 divisors (see below), whose sum is σ = 64818436032000. Its totient is φ = 11494260445824.

The previous prime is 28771920061877. The next prime is 28771920061883. The reversal of 28771920061880 is 8816002917782.

It is an interprime number because it is at equal distance from previous prime (28771920061877) and next prime (28771920061883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28771920061883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 876134501 + ... + 876167339.

It is an arithmetic number, because the mean of its divisors is an integer number (1012788063000).

Almost surely, 2^{28771920061880} is an apocalyptic number.

28771920061880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28771920061880 is an abundant number, since it is smaller than the sum of its proper divisors (36046515970120).

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

28771920061880 is a wasteful number, since it uses less digits than its factorization.

28771920061880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59796 (or 59792 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 28771920061880 in words is "twenty-eight trillion, seven hundred seventy-one billion, nine hundred twenty million, sixty-one thousand, eight hundred eighty".