671878281 has 4 divisors (see below), whose sum is σ = 895837712. Its totient is φ = 447918852.

The previous prime is 671878279. The next prime is 671878303. The reversal of 671878281 is 182878176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 671878281 - 2¹ = 671878279 is a prime.

It is a super-2 number, since 2×671878281² = 902840848959029922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671878281.

It is not an unprimeable number, because it can be changed into a prime (671878381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111979711 + ... + 111979716.

It is an arithmetic number, because the mean of its divisors is an integer number (223959428).

Almost surely, 2^671878281 is an apocalyptic number.

It is an amenable number.

671878281 is a deficient number, since it is larger than the sum of its proper divisors (223959431).

671878281 is a wasteful number, since it uses less digits than its factorization.

671878281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223959430.

The product of its digits is 301056, while the sum is 48.

The square root of 671878281 is about 25920.6149811304. The cubic root of 671878281 is about 875.8509407873.

The spelling of 671878281 in words is "six hundred seventy-one million, eight hundred seventy-eight thousand, two hundred eighty-one".