671023512 has 72 divisors (see below), whose sum is σ = 1857285300. Its totient is φ = 218863584.

The previous prime is 671023481. The next prime is 671023517. The reversal of 671023512 is 215320176.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671023517) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 156939 + ... + 161157.

Almost surely, 2^671023512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671023512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928642650).

671023512 is an abundant number, since it is smaller than the sum of its proper divisors (1186261788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671023512 is a wasteful number, since it uses less digits than its factorization.

671023512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325 (or 4271 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 671023512 is about 25904.1215253480. The cubic root of 671023512 is about 875.4793616098.

Adding to 671023512 its reverse (215320176), we get a palindrome (886343688).

The spelling of 671023512 in words is "six hundred seventy-one million, twenty-three thousand, five hundred twelve".