864278871556 has 27 divisors (see below), whose sum is σ = 1520380328103. Its totient is φ = 429896151720.

The previous prime is 864278871553. The next prime is 864278871583. The reversal of 864278871556 is 655178872468.

The square root of 864278871556 is 929666.

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

It is a super-2 number, since 2×864278871556² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 864278871491 and 864278871500.

It is not an unprimeable number, because it can be changed into a prime (864278871553) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 392317951 + ... + 392320153.

Almost surely, 2^864278871556 is an apocalyptic number.

864278871556 is the 929666-th square number.

It is an amenable number.

864278871556 is a deficient number, since it is larger than the sum of its proper divisors (656101456547).

864278871556 is an frugal number, since it uses more digits than its factorization.

864278871556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4832 (or 2416 counting only the distinct ones).

The product of its digits is 180633600, while the sum is 67.

The spelling of 864278871556 in words is "eight hundred sixty-four billion, two hundred seventy-eight million, eight hundred seventy-one thousand, five hundred fifty-six".