872661071 has 4 divisors (see below), whose sum is σ = 884952144. Its totient is φ = 860370000.

The previous prime is 872661047. The next prime is 872661073. The reversal of 872661071 is 170166278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 872661071 - 2⁶ = 872661007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872661073) 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, 6145430 + ... + 6145571.

It is an arithmetic number, because the mean of its divisors is an integer number (221238036).

Almost surely, 2^872661071 is an apocalyptic number.

872661071 is a deficient number, since it is larger than the sum of its proper divisors (12291073).

872661071 is a wasteful number, since it uses less digits than its factorization.

872661071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12291072.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 872661071 is about 29540.8373442596. The cubic root of 872661071 is about 955.6126003838.

The spelling of 872661071 in words is "eight hundred seventy-two million, six hundred sixty-one thousand, seventy-one".