671044540 has 24 divisors (see below), whose sum is σ = 1443565872. Its totient is φ = 261870720.

The previous prime is 671044529. The next prime is 671044547. The reversal of 671044540 is 45440176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671044547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408354 + ... + 409993.

It is an arithmetic number, because the mean of its divisors is an integer number (60148578).

Almost surely, 2^671044540 is an apocalyptic number.

It is an amenable number.

671044540 is an abundant number, since it is smaller than the sum of its proper divisors (772521332).

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

671044540 is a wasteful number, since it uses less digits than its factorization.

671044540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818397 (or 818395 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 671044540 is about 25904.5274035254. The cubic root of 671044540 is about 875.4885065391.

The spelling of 671044540 in words is "six hundred seventy-one million, forty-four thousand, five hundred forty".