671722587 has 6 divisors (see below), whose sum is σ = 970265972. Its totient is φ = 447815052.

The previous prime is 671722577. The next prime is 671722591. The reversal of 671722587 is 785227176.

671722587 is a `hidden beast` number, since 67 + 1 + 7 + 2 + 2 + 587 = 666.

It is not a de Polignac number, because 671722587 - 2¹⁰ = 671721563 is a prime.

It is a super-2 number, since 2×671722587² = 902422467771945138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671722537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37317913 + ... + 37317930.

Almost surely, 2^671722587 is an apocalyptic number.

671722587 is a deficient number, since it is larger than the sum of its proper divisors (298543385).

671722587 is a wasteful number, since it uses less digits than its factorization.

671722587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74635849 (or 74635846 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 671722587 is about 25917.6115218976. The cubic root of 671722587 is about 875.7832820685.

The spelling of 671722587 in words is "six hundred seventy-one million, seven hundred twenty-two thousand, five hundred eighty-seven".