647800793 has 6 divisors (see below), whose sum is σ = 686017854. Its totient is φ = 609596096.

The previous prime is 647800789. The next prime is 647800817. The reversal of 647800793 is 397008746.

It can be written as a sum of positive squares in 3 ways, for example, as 15429184 + 632371609 = 3928^2 + 25147^2 .

It is not a de Polignac number, because 647800793 - 2² = 647800789 is a prime.

It is a super-2 number, since 2×647800793² = 839291734822857698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647800093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101855 + ... + 108027.

It is an arithmetic number, because the mean of its divisors is an integer number (114336309).

Almost surely, 2^647800793 is an apocalyptic number.

It is an amenable number.

647800793 is a deficient number, since it is larger than the sum of its proper divisors (38217061).

647800793 is an frugal number, since it uses more digits than its factorization.

647800793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12363 (or 6190 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 647800793 is about 25451.9310269378. The cubic root of 647800793 is about 865.2610583399.

The spelling of 647800793 in words is "six hundred forty-seven million, eight hundred thousand, seven hundred ninety-three".