13451281920 has 480 divisors, whose sum is σ = 49485047040. Its totient is φ = 3370844160.

The previous prime is 13451281891. The next prime is 13451281931. The reversal of 13451281920 is 2918215431.

13451281920 is a `hidden beast` number, since 1 + 345 + 128 + 192 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26426626 + ... + 26427134.

It is an arithmetic number, because the mean of its divisors is an integer number (103093848).

Almost surely, 2^13451281920 is an apocalyptic number.

13451281920 is a gapful number since it is divisible by the number (10) 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 13451281920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24742523520).

13451281920 is an abundant number, since it is smaller than the sum of its proper divisors (36033765120).

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

13451281920 is a wasteful number, since it uses less digits than its factorization.

13451281920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606 (or 587 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 13451281920 in words is "thirteen billion, four hundred fifty-one million, two hundred eighty-one thousand, nine hundred twenty".