28917145772 has 12 divisors (see below), whose sum is σ = 51559816896. Its totient is φ = 14185769520.

The previous prime is 28917145769. The next prime is 28917145781. The reversal of 28917145772 is 27754171982.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68200604 + ... + 68201027.

It is an arithmetic number, because the mean of its divisors is an integer number (4296651408).

Almost surely, 2^28917145772 is an apocalyptic number.

It is an amenable number.

28917145772 is a deficient number, since it is larger than the sum of its proper divisors (22642671124).

28917145772 is a wasteful number, since it uses less digits than its factorization.

28917145772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136401688 (or 136401686 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 53.

The spelling of 28917145772 in words is "twenty-eight billion, nine hundred seventeen million, one hundred forty-five thousand, seven hundred seventy-two".