671823837 has 12 divisors (see below), whose sum is σ = 996640060. Its totient is φ = 435777408.

The previous prime is 671823739. The next prime is 671823851. The reversal of 671823837 is 738328176.

It can be written as a sum of positive squares in 2 ways, for example, as 648262521 + 23561316 = 25461^2 + 4854^2 .

It is not a de Polignac number, because 671823837 - 2¹² = 671819741 is a prime.

It is a super-2 number, since 2×671823837² = 902694535922805138, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 671823792 and 671823801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671823857) 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, 1008412 + ... + 1009077.

Almost surely, 2^671823837 is an apocalyptic number.

It is an amenable number.

671823837 is a deficient number, since it is larger than the sum of its proper divisors (324816223).

671823837 is a wasteful number, since it uses less digits than its factorization.

671823837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017532 (or 2017529 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 671823837 is about 25919.5647532901. The cubic root of 671823837 is about 875.8272826744.

The spelling of 671823837 in words is "six hundred seventy-one million, eight hundred twenty-three thousand, eight hundred thirty-seven".