28445475731 has 8 divisors (see below), whose sum is σ = 29242978128. Its totient is φ = 27652912000.

The previous prime is 28445475697. The next prime is 28445475733. The reversal of 28445475731 is 13757454482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28445475731 is a prime.

It is a super-2 number, since 2×28445475731² (a number of 22 digits) contains 22 as substring.

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 28445475731.

It is not an unprimeable number, because it can be changed into a prime (28445475733) 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, 1222985 + ... + 1246026.

It is an arithmetic number, because the mean of its divisors is an integer number (3655372266).

Almost surely, 2^28445475731 is an apocalyptic number.

28445475731 is a deficient number, since it is larger than the sum of its proper divisors (797502397).

28445475731 is a wasteful number, since it uses less digits than its factorization.

28445475731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469333.

The product of its digits is 3763200, while the sum is 50.

The spelling of 28445475731 in words is "twenty-eight billion, four hundred forty-five million, four hundred seventy-five thousand, seven hundred thirty-one".