13404370644 has 96 divisors (see below), whose sum is σ = 40088079360. Its totient is φ = 3794004576.

The previous prime is 13404370601. The next prime is 13404370669. The reversal of 13404370644 is 44607340431.

13404370644 is a `hidden beast` number, since 1 + 3 + 4 + 0 + 4 + 3 + 7 + 0 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 13404370599 and 13404370608.

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, 1962 + ... + 163745.

It is an arithmetic number, because the mean of its divisors is an integer number (417584160).

Almost surely, 2^13404370644 is an apocalyptic number.

13404370644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13404370644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20044039680).

13404370644 is an abundant number, since it is smaller than the sum of its proper divisors (26683708716).

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

13404370644 is a wasteful number, since it uses less digits than its factorization.

13404370644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165834 (or 165826 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

The spelling of 13404370644 in words is "thirteen billion, four hundred four million, three hundred seventy thousand, six hundred forty-four".