13043172720 has 40 divisors (see below), whose sum is σ = 40433836176. Its totient is φ = 3478179328.

The previous prime is 13043172719. The next prime is 13043172721. The reversal of 13043172720 is 2727134031.

It is an interprime number because it is at equal distance from previous prime (13043172719) and next prime (13043172721).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13043172721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27173037 + ... + 27173516.

Almost surely, 2^13043172720 is an apocalyptic number.

13043172720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13043172720 is an abundant number, since it is smaller than the sum of its proper divisors (27390663456).

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

13043172720 is a wasteful number, since it uses less digits than its factorization.

13043172720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54346569 (or 54346563 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The spelling of 13043172720 in words is "thirteen billion, forty-three million, one hundred seventy-two thousand, seven hundred twenty".