12447421878 has 64 divisors (see below), whose sum is σ = 25959720960. Its totient is φ = 3974572800.

The previous prime is 12447421867. The next prime is 12447421967. The reversal of 12447421878 is 87812474421.

It is a super-2 number, since 2×12447421878² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16843233 + ... + 16843971.

It is an arithmetic number, because the mean of its divisors is an integer number (405620640).

Almost surely, 2^12447421878 is an apocalyptic number.

12447421878 is an abundant number, since it is smaller than the sum of its proper divisors (13512299082).

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

12447421878 is a wasteful number, since it uses less digits than its factorization.

12447421878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573.

The product of its digits is 802816, while the sum is 48.

The spelling of 12447421878 in words is "twelve billion, four hundred forty-seven million, four hundred twenty-one thousand, eight hundred seventy-eight".