671756142 has 16 divisors (see below), whose sum is σ = 1353179520. Its totient is φ = 222307512.

The previous prime is 671756131. The next prime is 671756149. The reversal of 671756142 is 241657176.

It is a self number, because there is not a number n which added to its sum of digits gives 671756142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671756149) 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, 401898 + ... + 403565.

It is an arithmetic number, because the mean of its divisors is an integer number (84573720).

Almost surely, 2^671756142 is an apocalyptic number.

671756142 is an abundant number, since it is smaller than the sum of its proper divisors (681423378).

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

671756142 is a wasteful number, since it uses less digits than its factorization.

671756142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805607.

The product of its digits is 70560, while the sum is 39.

The square root of 671756142 is about 25918.2588535573. The cubic root of 671756142 is about 875.7978646850.

The spelling of 671756142 in words is "six hundred seventy-one million, seven hundred fifty-six thousand, one hundred forty-two".