647767049 has 4 divisors (see below), whose sum is σ = 648930564. Its totient is φ = 646603536.

The previous prime is 647767027. The next prime is 647767051. The reversal of 647767049 is 940767746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 940767746 = 2 ⋅470383873.

It can be written as a sum of positive squares in 2 ways, for example, as 16752649 + 631014400 = 4093^2 + 25120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-647767049 is a prime.

It is a super-3 number, since 3×647767049³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 647766988 and 647767006.

It is not an unprimeable number, because it can be changed into a prime (647767069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580922 + ... + 582035.

It is an arithmetic number, because the mean of its divisors is an integer number (162232641).

Almost surely, 2^647767049 is an apocalyptic number.

It is an amenable number.

647767049 is a deficient number, since it is larger than the sum of its proper divisors (1163515).

647767049 is a wasteful number, since it uses less digits than its factorization.

647767049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163514.

The product of its (nonzero) digits is 1778112, while the sum is 50.

The square root of 647767049 is about 25451.2681216477. The cubic root of 647767049 is about 865.2460342376.

The spelling of 647767049 in words is "six hundred forty-seven million, seven hundred sixty-seven thousand, forty-nine".