871406781 has 8 divisors (see below), whose sum is σ = 1327857984. Its totient is φ = 497946720.

The previous prime is 871406771. The next prime is 871406797. The reversal of 871406781 is 187604178.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 871406781 - 2¹⁰ = 871405757 is a prime.

It is a super-2 number, since 2×871406781² = 1518699555945563922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871406741) 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, 20747760 + ... + 20747801.

It is an arithmetic number, because the mean of its divisors is an integer number (165982248).

Almost surely, 2^871406781 is an apocalyptic number.

It is an amenable number.

871406781 is a deficient number, since it is larger than the sum of its proper divisors (456451203).

871406781 is a wasteful number, since it uses less digits than its factorization.

871406781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41495571.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 871406781 is about 29519.5999464762. The cubic root of 871406781 is about 955.1545416596.

The spelling of 871406781 in words is "eight hundred seventy-one million, four hundred six thousand, seven hundred eighty-one".