28207777180 has 24 divisors (see below), whose sum is σ = 64621453680. Its totient is φ = 10257373440.

The previous prime is 28207777177. The next prime is 28207777181. The reversal of 28207777180 is 8177770282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28207777181) 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, 64108365 + ... + 64108804.

It is an arithmetic number, because the mean of its divisors is an integer number (2692560570).

Almost surely, 2^28207777180 is an apocalyptic number.

28207777180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28207777180 is an abundant number, since it is smaller than the sum of its proper divisors (36413676500).

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

28207777180 is a wasteful number, since it uses less digits than its factorization.

28207777180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128217189 (or 128217187 counting only the distinct ones).

The product of its (nonzero) digits is 614656, while the sum is 49.

The spelling of 28207777180 in words is "twenty-eight billion, two hundred seven million, seven hundred seventy-seven thousand, one hundred eighty".