28077525780 has 24 divisors (see below), whose sum is σ = 78617072352. Its totient is φ = 7487340192.

The previous prime is 28077525767. The next prime is 28077525787. The reversal of 28077525780 is 8752577082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077525787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233979322 + ... + 233979441.

It is an arithmetic number, because the mean of its divisors is an integer number (3275711348).

Almost surely, 2^28077525780 is an apocalyptic number.

28077525780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28077525780 is an abundant number, since it is smaller than the sum of its proper divisors (50539546572).

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

28077525780 is a wasteful number, since it uses less digits than its factorization.

28077525780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467958775 (or 467958773 counting only the distinct ones).

The product of its (nonzero) digits is 2195200, while the sum is 51.

The spelling of 28077525780 in words is "twenty-eight billion, seventy-seven million, five hundred twenty-five thousand, seven hundred eighty".