1278242792836 has 81 divisors (see below), whose sum is σ = 2352071571213. Its totient is φ = 607807334400.

The previous prime is 1278242792821. The next prime is 1278242792837. The reversal of 1278242792836 is 6382972428721.

The square root of 1278242792836 is 1130594.

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

It can be written as a sum of positive squares in 13 ways, for example, as 237549012100 + 1040693780736 = 487390^2 + 1020144^2 .

It is a super-4 number, since 4×1278242792836⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278242792837) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 6623019556 + ... + 6623019748.

Almost surely, 2^{1278242792836} is an apocalyptic number.

1278242792836 is the 1130594-th square number.

It is an amenable number.

1278242792836 is a deficient number, since it is larger than the sum of its proper divisors (1073828778377).

1278242792836 is an equidigital number, since it uses as much as digits as its factorization.

1278242792836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 325 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 61.

The spelling of 1278242792836 in words is "one trillion, two hundred seventy-eight billion, two hundred forty-two million, seven hundred ninety-two thousand, eight hundred thirty-six".