13781172378 has 16 divisors (see below), whose sum is σ = 29012994720. Its totient is φ = 4351949136.

The previous prime is 13781172347. The next prime is 13781172401. The reversal of 13781172378 is 87327118731.

It is a super-2 number, since 2×13781172378² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60443625 + ... + 60443852.

It is an arithmetic number, because the mean of its divisors is an integer number (1813312170).

Almost surely, 2^13781172378 is an apocalyptic number.

13781172378 is an abundant number, since it is smaller than the sum of its proper divisors (15231822342).

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

13781172378 is a wasteful number, since it uses less digits than its factorization.

13781172378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120887501.

The product of its digits is 395136, while the sum is 48.

The spelling of 13781172378 in words is "thirteen billion, seven hundred eighty-one million, one hundred seventy-two thousand, three hundred seventy-eight".