28909198512 has 40 divisors (see below), whose sum is σ = 82980108080. Its totient is φ = 9636399360.

The previous prime is 28909198511. The next prime is 28909198517. The reversal of 28909198512 is 21589190982.

28909198512 is a `hidden beast` number, since 28 + 90 + 9 + 19 + 8 + 512 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28909198511) 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, 33459289 + ... + 33460152.

It is an arithmetic number, because the mean of its divisors is an integer number (2074502702).

Almost surely, 2^28909198512 is an apocalyptic number.

It is an amenable number.

28909198512 is an abundant number, since it is smaller than the sum of its proper divisors (54070909568).

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

28909198512 is a wasteful number, since it uses less digits than its factorization.

28909198512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66919458 (or 66919446 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 28909198512 in words is "twenty-eight billion, nine hundred nine million, one hundred ninety-eight thousand, five hundred twelve".