637671 has 4 divisors (see below), whose sum is σ = 850232. Its totient is φ = 425112.

The previous prime is 637669. The next prime is 637691. The reversal of 637671 is 176736.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 637671 - 2¹ = 637669 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637601) 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 3 ways as a sum of consecutive naturals, for example, 106276 + ... + 106281.

It is an arithmetic number, because the mean of its divisors is an integer number (212558).

2⁶³⁷⁶⁷¹ is an apocalyptic number.

637671 is a deficient number, since it is larger than the sum of its proper divisors (212561).

637671 is a wasteful number, since it uses less digits than its factorization.

637671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212560.

The product of its digits is 5292, while the sum is 30.

The square root of 637671 is about 798.5430483074. The cubic root of 637671 is about 86.0727255747.

The spelling of 637671 in words is "six hundred thirty-seven thousand, six hundred seventy-one".