671542840 has 64 divisors (see below), whose sum is σ = 1684087200. Its totient is φ = 239505408.

The previous prime is 671542829. The next prime is 671542843. The reversal of 671542840 is 48245176.

It is a self number, because there is not a number n which added to its sum of digits gives 671542840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671542843) 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 15 ways as a sum of consecutive naturals, for example, 13069 + ... + 38908.

Almost surely, 2^671542840 is an apocalyptic number.

It is an amenable number.

671542840 is an abundant number, since it is smaller than the sum of its proper divisors (1012544360).

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

671542840 is a wasteful number, since it uses less digits than its factorization.

671542840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52024 (or 52020 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 671542840 is about 25914.1436285284. The cubic root of 671542840 is about 875.7051578229.

The spelling of 671542840 in words is "six hundred seventy-one million, five hundred forty-two thousand, eight hundred forty".