28660907272 has 8 divisors (see below), whose sum is σ = 53739201150. Its totient is φ = 14330453632.

The previous prime is 28660907173. The next prime is 28660907273. The reversal of 28660907272 is 27270906682.

It can be written as a sum of positive squares in only one way, i.e., 21583723396 + 7077183876 = 146914^2 + 84126^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28660907273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1791306697 + ... + 1791306712.

Almost surely, 2^28660907272 is an apocalyptic number.

It is an amenable number.

28660907272 is a deficient number, since it is larger than the sum of its proper divisors (25078293878).

28660907272 is a wasteful number, since it uses less digits than its factorization.

28660907272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582613415 (or 3582613411 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 28660907272 in words is "twenty-eight billion, six hundred sixty million, nine hundred seven thousand, two hundred seventy-two".