28205692712 has 8 divisors (see below), whose sum is σ = 52885673850. Its totient is φ = 14102846352.

The previous prime is 28205692673. The next prime is 28205692727. The reversal of 28205692712 is 21729650282.

It can be written as a sum of positive squares in only one way, i.e., 26996461636 + 1209231076 = 164306^2 + 34774^2 .

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

It is a super-2 number, since 2×28205692712² (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, 1762855787 + ... + 1762855802.

Almost surely, 2^28205692712 is an apocalyptic number.

It is an amenable number.

28205692712 is a deficient number, since it is larger than the sum of its proper divisors (24679981138).

28205692712 is a wasteful number, since it uses less digits than its factorization.

28205692712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525711595 (or 3525711591 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 28205692712 in words is "twenty-eight billion, two hundred five million, six hundred ninety-two thousand, seven hundred twelve".