647619673 has 4 divisors (see below), whose sum is σ = 651237840. Its totient is φ = 644001508.

The previous prime is 647619659. The next prime is 647619757. The reversal of 647619673 is 376916746.

It is a happy number.

647619673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 647619673 - 2¹⁷ = 647488601 is a prime.

It is a super-2 number, since 2×647619673² = 838822481713253858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647619653) 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, 1808815 + ... + 1809172.

It is an arithmetic number, because the mean of its divisors is an integer number (162809460).

Almost surely, 2^647619673 is an apocalyptic number.

It is an amenable number.

647619673 is a deficient number, since it is larger than the sum of its proper divisors (3618167).

647619673 is a wasteful number, since it uses less digits than its factorization.

647619673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618166.

The product of its digits is 1143072, while the sum is 49.

The square root of 647619673 is about 25448.3726984654. The cubic root of 647619673 is about 865.1804107641.

The spelling of 647619673 in words is "six hundred forty-seven million, six hundred nineteen thousand, six hundred seventy-three".