13478820891 has 8 divisors (see below), whose sum is σ = 17972298240. Its totient is φ = 8985612072.

The previous prime is 13478820871. The next prime is 13478820899. The reversal of 13478820891 is 19802887431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13478820891 - 2⁶ = 13478820827 is a prime.

It is a super-2 number, since 2×13478820891² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13478820899) 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, 154906 + ... + 225728.

It is an arithmetic number, because the mean of its divisors is an integer number (2246537280).

Almost surely, 2^13478820891 is an apocalyptic number.

13478820891 is a deficient number, since it is larger than the sum of its proper divisors (4493477349).

13478820891 is an equidigital number, since it uses as much as digits as its factorization.

13478820891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134265.

The product of its (nonzero) digits is 774144, while the sum is 51.

The spelling of 13478820891 in words is "thirteen billion, four hundred seventy-eight million, eight hundred twenty thousand, eight hundred ninety-one".