28001195972 has 12 divisors (see below), whose sum is σ = 50141676816. Its totient is φ = 13675002600.

The previous prime is 28001195951. The next prime is 28001195977. The reversal of 28001195972 is 27959110082.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28001195977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81398654 + ... + 81398997.

It is an arithmetic number, because the mean of its divisors is an integer number (4178473068).

Almost surely, 2^28001195972 is an apocalyptic number.

It is an amenable number.

28001195972 is a deficient number, since it is larger than the sum of its proper divisors (22140480844).

28001195972 is a wasteful number, since it uses less digits than its factorization.

28001195972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162797698 (or 162797696 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 28001195972 in words is "twenty-eight billion, one million, one hundred ninety-five thousand, nine hundred seventy-two".