1647725673 has 32 divisors (see below), whose sum is σ = 2435328000. Its totient is φ = 982612800.

The previous prime is 1647725669. The next prime is 1647725687. The reversal of 1647725673 is 3765277461.

It is not a de Polignac number, because 1647725673 - 2² = 1647725669 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1647725603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 908938 + ... + 910748.

It is an arithmetic number, because the mean of its divisors is an integer number (76104000).

Almost surely, 2^1647725673 is an apocalyptic number.

It is an amenable number.

1647725673 is a deficient number, since it is larger than the sum of its proper divisors (787602327).

1647725673 is a wasteful number, since it uses less digits than its factorization.

1647725673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2253.

The product of its digits is 1481760, while the sum is 48.

The square root of 1647725673 is about 40592.1873394376. The cubic root of 1647725673 is about 1181.1225726768.

The spelling of 1647725673 in words is "one billion, six hundred forty-seven million, seven hundred twenty-five thousand, six hundred seventy-three".