1671720723 has 12 divisors (see below), whose sum is σ = 2415948808. Its totient is φ = 1113907680.

The previous prime is 1671720709. The next prime is 1671720727. The reversal of 1671720723 is 3270271761.

1671720723 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1671720723 - 2²⁸ = 1403285267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671720727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28858 + ... + 64623.

Almost surely, 2^1671720723 is an apocalyptic number.

1671720723 is a deficient number, since it is larger than the sum of its proper divisors (744228085).

1671720723 is a wasteful number, since it uses less digits than its factorization.

1671720723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95474 (or 95471 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 1671720723 is about 40886.6814867629. The cubic root of 1671720723 is about 1186.8283414029.

The spelling of 1671720723 in words is "one billion, six hundred seventy-one million, seven hundred twenty thousand, seven hundred twenty-three".