28188212740 has 24 divisors (see below), whose sum is σ = 59385598272. Its totient is φ = 11239027680.

The previous prime is 28188212693. The next prime is 28188212749. The reversal of 28188212740 is 4721288182.

It is not an unprimeable number, because it can be changed into a prime (28188212749) 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, 2259714 + ... + 2272153.

It is an arithmetic number, because the mean of its divisors is an integer number (2474399928).

Almost surely, 2^28188212740 is an apocalyptic number.

28188212740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28188212740 is an abundant number, since it is smaller than the sum of its proper divisors (31197385532).

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

28188212740 is a wasteful number, since it uses less digits than its factorization.

28188212740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4532187 (or 4532185 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 43.

The spelling of 28188212740 in words is "twenty-eight billion, one hundred eighty-eight million, two hundred twelve thousand, seven hundred forty".