12281279978 has 32 divisors (see below), whose sum is σ = 21316048128. Its totient is φ = 5244825600.

The previous prime is 12281279971. The next prime is 12281279993. The reversal of 12281279978 is 87997218221.

It is not an unprimeable number, because it can be changed into a prime (12281279971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187343 + ... + 244253.

It is an arithmetic number, because the mean of its divisors is an integer number (666126504).

Almost surely, 2^12281279978 is an apocalyptic number.

12281279978 is a deficient number, since it is larger than the sum of its proper divisors (9034768150).

12281279978 is a wasteful number, since it uses less digits than its factorization.

12281279978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57518.

The product of its digits is 2032128, while the sum is 56.

The spelling of 12281279978 in words is "twelve billion, two hundred eighty-one million, two hundred seventy-nine thousand, nine hundred seventy-eight".