647680505796 has 81 divisors (see below), whose sum is σ = 1653201789421. Its totient is φ = 213802667904.

The previous prime is 647680505789. The next prime is 647680505831. The reversal of 647680505796 is 697505086746.

The square root of 647680505796 is 804786.

It is a perfect power (a square), and thus also a powerful number.

647680505796 is a `hidden beast` number, since 6 + 4 + 7 + 6 + 8 + 0 + 50 + 579 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11412648900 + 636267856896 = 106830^2 + 797664^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 545644315 + ... + 545645501.

Almost surely, 2^647680505796 is an apocalyptic number.

647680505796 is the 804786-th square number.

It is an amenable number.

647680505796 is an abundant number, since it is smaller than the sum of its proper divisors (1005521283625).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647680505796 is a wasteful number, since it uses less digits than its factorization.

647680505796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610 (or 1305 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 63.

It can be divided in two parts, 647680 and 505796, that added together give a square (1153476 = 1074²).

The spelling of 647680505796 in words is "six hundred forty-seven billion, six hundred eighty million, five hundred five thousand, seven hundred ninety-six".