671720049 has 48 divisors (see below), whose sum is σ = 1302747264. Its totient is φ = 322099200.

The previous prime is 671720017. The next prime is 671720081. The reversal of 671720049 is 940027176.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (671720017) and next prime (671720081).

It is not a de Polignac number, because 671720049 - 2⁵ = 671720017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 671719995 and 671720022.

It is not an unprimeable number, because it can be changed into a prime (671720009) 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 47 ways as a sum of consecutive naturals, for example, 28272 + ... + 46289.

It is an arithmetic number, because the mean of its divisors is an integer number (27140568).

Almost surely, 2^671720049 is an apocalyptic number.

It is an amenable number.

671720049 is a deficient number, since it is larger than the sum of its proper divisors (631027215).

671720049 is a wasteful number, since it uses less digits than its factorization.

671720049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74598 (or 74595 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 671720049 is about 25917.5625590062. The cubic root of 671720049 is about 875.7821790632.

The spelling of 671720049 in words is "six hundred seventy-one million, seven hundred twenty thousand, forty-nine".