28291772473 has 4 divisors (see below), whose sum is σ = 28292109300. Its totient is φ = 28291435648.

The previous prime is 28291772441. The next prime is 28291772501. The reversal of 28291772473 is 37427719282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10930284304 + 17361488169 = 104548^2 + 131763^2 .

It is a cyclic number.

It is not a de Polignac number, because 28291772473 - 2⁵ = 28291772441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28291772473.

It is not an unprimeable number, because it can be changed into a prime (28291772423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71553 + ... + 248401.

It is an arithmetic number, because the mean of its divisors is an integer number (7073027325).

Almost surely, 2^28291772473 is an apocalyptic number.

It is an amenable number.

28291772473 is a deficient number, since it is larger than the sum of its proper divisors (336827).

28291772473 is a wasteful number, since it uses less digits than its factorization.

28291772473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336826.

The product of its digits is 2370816, while the sum is 52.

The spelling of 28291772473 in words is "twenty-eight billion, two hundred ninety-one million, seven hundred seventy-two thousand, four hundred seventy-three".