28118721912 has 32 divisors (see below), whose sum is σ = 70379267280. Its totient is φ = 9361912320.

The previous prime is 28118721877. The next prime is 28118721947. The reversal of 28118721912 is 21912781182.

It is an interprime number because it is at equal distance from previous prime (28118721877) and next prime (28118721947).

It is a super-3 number, since 3×28118721912³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666289 + ... + 707232.

Almost surely, 2^28118721912 is an apocalyptic number.

It is an amenable number.

28118721912 is an abundant number, since it is smaller than the sum of its proper divisors (42260545368).

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

28118721912 is a wasteful number, since it uses less digits than its factorization.

28118721912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374383 (or 1374379 counting only the distinct ones).

The product of its digits is 32256, while the sum is 42.

The spelling of 28118721912 in words is "twenty-eight billion, one hundred eighteen million, seven hundred twenty-one thousand, nine hundred twelve".