28518394980 has 24 divisors (see below), whose sum is σ = 79851506112. Its totient is φ = 7604905312.

The previous prime is 28518394973. The next prime is 28518394981. The reversal of 28518394980 is 8949381582.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28518394980.

It is not an unprimeable number, because it can be changed into a prime (28518394981) 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, 237653232 + ... + 237653351.

It is an arithmetic number, because the mean of its divisors is an integer number (3327146088).

Almost surely, 2^28518394980 is an apocalyptic number.

28518394980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28518394980 is an abundant number, since it is smaller than the sum of its proper divisors (51333111132).

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

28518394980 is a wasteful number, since it uses less digits than its factorization.

28518394980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475306595 (or 475306593 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 57.

The spelling of 28518394980 in words is "twenty-eight billion, five hundred eighteen million, three hundred ninety-four thousand, nine hundred eighty".