26861243236 has 45 divisors (see below), whose sum is σ = 49838212739. Its totient is φ = 12667695048.

The previous prime is 26861243209. The next prime is 26861243249. The reversal of 26861243236 is 63234216862.

It is a happy number.

The square root of 26861243236 is 163894.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26861243192 and 26861243201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 118331355 + ... + 118331581.

Almost surely, 2^26861243236 is an apocalyptic number.

26861243236 is the 163894-th square number.

It is an amenable number.

26861243236 is a deficient number, since it is larger than the sum of its proper divisors (22976969503).

26861243236 is an frugal number, since it uses more digits than its factorization.

26861243236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 248 counting only the distinct ones).

The product of its digits is 497664, while the sum is 43.

The spelling of 26861243236 in words is "twenty-six billion, eight hundred sixty-one million, two hundred forty-three thousand, two hundred thirty-six".