13278620418 has 128 divisors (see below), whose sum is σ = 31609374720. Its totient is φ = 3640412160.

The previous prime is 13278620387. The next prime is 13278620441. The reversal of 13278620418 is 81402687231.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13278620418.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 40116513 + ... + 40116843.

It is an arithmetic number, because the mean of its divisors is an integer number (246948240).

Almost surely, 2^13278620418 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13278620418, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15804687360).

13278620418 is an abundant number, since it is smaller than the sum of its proper divisors (18330754302).

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

13278620418 is a wasteful number, since it uses less digits than its factorization.

13278620418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 129024, while the sum is 42.

The spelling of 13278620418 in words is "thirteen billion, two hundred seventy-eight million, six hundred twenty thousand, four hundred eighteen".