28218474525 has 24 divisors (see below), whose sum is σ = 47647200384. Its totient is φ = 14729641600.

The previous prime is 28218474521. The next prime is 28218474547. The reversal of 28218474525 is 52547481282.

It is not a de Polignac number, because 28218474525 - 2² = 28218474521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218474521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3999096 + ... + 4006145.

It is an arithmetic number, because the mean of its divisors is an integer number (1985300016).

Almost surely, 2^28218474525 is an apocalyptic number.

28218474525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28218474525 is a deficient number, since it is larger than the sum of its proper divisors (19428725859).

28218474525 is a wasteful number, since it uses less digits than its factorization.

28218474525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8005301 (or 8005296 counting only the distinct ones).

The product of its digits is 1433600, while the sum is 48.

The spelling of 28218474525 in words is "twenty-eight billion, two hundred eighteen million, four hundred seventy-four thousand, five hundred twenty-five".