13406773644 has 108 divisors (see below), whose sum is σ = 38391000648. Its totient is φ = 4062571200.

The previous prime is 13406773643. The next prime is 13406773657. The reversal of 13406773644 is 44637760431.

It is a tau number, because it is divible by the number of its divisors (108).

It is a self number, because there is not a number n which added to its sum of digits gives 13406773644.

It is not an unprimeable number, because it can be changed into a prime (13406773643) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 265464 + ... + 311904.

Almost surely, 2^13406773644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13406773644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19195500324).

13406773644 is an abundant number, since it is smaller than the sum of its proper divisors (24984227004).

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

13406773644 is an equidigital number, since it uses as much as digits as its factorization.

13406773644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46480 (or 46457 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 45.

The spelling of 13406773644 in words is "thirteen billion, four hundred six million, seven hundred seventy-three thousand, six hundred forty-four".