647767443 has 4 divisors (see below), whose sum is σ = 863689928. Its totient is φ = 431844960.

The previous prime is 647767433. The next prime is 647767451. The reversal of 647767443 is 344767746.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 647767443 - 2¹⁷ = 647636371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647767392 and 647767401.

It is not an unprimeable number, because it can be changed into a prime (647767433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107961238 + ... + 107961243.

It is an arithmetic number, because the mean of its divisors is an integer number (215922482).

Almost surely, 2^647767443 is an apocalyptic number.

647767443 is a deficient number, since it is larger than the sum of its proper divisors (215922485).

647767443 is a wasteful number, since it uses less digits than its factorization.

647767443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215922484.

The product of its digits is 2370816, while the sum is 48.

The square root of 647767443 is about 25451.2758619288. The cubic root of 647767443 is about 865.2462096643.

It can be divided in two parts, 6477 and 67443, that added together give a triangular number (73920 = T₃₈₄).

The spelling of 647767443 in words is "six hundred forty-seven million, seven hundred sixty-seven thousand, four hundred forty-three".