28861775972 has 6 divisors (see below), whose sum is σ = 50508107958. Its totient is φ = 14430887984.

The previous prime is 28861775953. The next prime is 28861776101. The reversal of 28861775972 is 27957716882.

It can be written as a sum of positive squares in only one way, i.e., 28810309696 + 51466276 = 169736^2 + 7174^2 .

It is a super-2 number, since 2×28861775972² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3607721993 + ... + 3607722000.

It is an arithmetic number, because the mean of its divisors is an integer number (8418017993).

Almost surely, 2^28861775972 is an apocalyptic number.

It is an amenable number.

28861775972 is a deficient number, since it is larger than the sum of its proper divisors (21646331986).

28861775972 is a wasteful number, since it uses less digits than its factorization.

28861775972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7215443997 (or 7215443995 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 62.

The spelling of 28861775972 in words is "twenty-eight billion, eight hundred sixty-one million, seven hundred seventy-five thousand, nine hundred seventy-two".