12249739578 has 32 divisors (see below), whose sum is σ = 25014173184. Its totient is φ = 3998194992.

The previous prime is 12249739501. The next prime is 12249739609. The reversal of 12249739578 is 87593794221.

It is a happy number.

It is a super-2 number, since 2×12249739578² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24100 + ... + 158367.

It is an arithmetic number, because the mean of its divisors is an integer number (781692912).

Almost surely, 2^12249739578 is an apocalyptic number.

12249739578 is an abundant number, since it is smaller than the sum of its proper divisors (12764433606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12249739578 is a wasteful number, since it uses less digits than its factorization.

12249739578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182706.

The product of its digits is 7620480, while the sum is 57.

The spelling of 12249739578 in words is "twelve billion, two hundred forty-nine million, seven hundred thirty-nine thousand, five hundred seventy-eight".