28418778672 has 40 divisors (see below), whose sum is σ = 73464933360. Its totient is φ = 9466506240.

The previous prime is 28418778659. The next prime is 28418778677. The reversal of 28418778672 is 27687781482.

It is not an unprimeable number, because it can be changed into a prime (28418778677) 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, 128797 + ... + 270972.

It is an arithmetic number, because the mean of its divisors is an integer number (1836623334).

Almost surely, 2^28418778672 is an apocalyptic number.

It is an amenable number.

28418778672 is an abundant number, since it is smaller than the sum of its proper divisors (45046154688).

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

28418778672 is a wasteful number, since it uses less digits than its factorization.

28418778672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401261 (or 401255 counting only the distinct ones).

The product of its digits is 16859136, while the sum is 60.

The spelling of 28418778672 in words is "twenty-eight billion, four hundred eighteen million, seven hundred seventy-eight thousand, six hundred seventy-two".