28128734451 has 24 divisors (see below), whose sum is σ = 40955326464. Its totient is φ = 18603062640.

The previous prime is 28128734437. The next prime is 28128734477. The reversal of 28128734451 is 15443782182.

28128734451 is a `hidden beast` number, since 2 + 8 + 128 + 73 + 4 + 451 = 666.

It is not a de Polignac number, because 28128734451 - 2¹³ = 28128726259 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28128734397 and 28128734406.

It is not an unprimeable number, because it can be changed into a prime (28128734401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 608580 + ... + 653166.

It is an arithmetic number, because the mean of its divisors is an integer number (1706471936).

Almost surely, 2^28128734451 is an apocalyptic number.

28128734451 is a deficient number, since it is larger than the sum of its proper divisors (12826592013).

28128734451 is a wasteful number, since it uses less digits than its factorization.

28128734451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45151 (or 45148 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The spelling of 28128734451 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred thirty-four thousand, four hundred fifty-one".