871806894436 has 9 divisors (see below), whose sum is σ = 1525665333241. Its totient is φ = 435902513512.

The previous prime is 871806894379. The next prime is 871806894451. The reversal of 871806894436 is 634498608178.

The square root of 871806894436 is 933706.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 770901560100 + 100905334336 = 878010^2 + 317656^2 .

It is a super-2 number, since 2×871806894436² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1633986 + ... + 2100838.

Almost surely, 2^871806894436 is an apocalyptic number.

871806894436 is the 933706-th square number.

It is an amenable number.

871806894436 is a deficient number, since it is larger than the sum of its proper divisors (653858438805).

871806894436 is an frugal number, since it uses more digits than its factorization.

871806894436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933710 (or 466855 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 64.

Multiplying 871806894436 by its sum of digits (64), we get a square (55795641243904 = 7469648²).

The spelling of 871806894436 in words is "eight hundred seventy-one billion, eight hundred six million, eight hundred ninety-four thousand, four hundred thirty-six".