13478820856 has 64 divisors (see below), whose sum is σ = 26989200000. Its totient is φ = 6292388736.

The previous prime is 13478820853. The next prime is 13478820871. The reversal of 13478820856 is 65802887431.

It is a super-2 number, since 2×13478820856² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13478820851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6420495 + ... + 6422593.

It is an arithmetic number, because the mean of its divisors is an integer number (421706250).

Almost surely, 2^13478820856 is an apocalyptic number.

It is an amenable number.

13478820856 is an abundant number, since it is smaller than the sum of its proper divisors (13510379144).

13478820856 is a wasteful number, since it uses less digits than its factorization.

13478820856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716 (or 2712 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 13478820856 in words is "thirteen billion, four hundred seventy-eight million, eight hundred twenty thousand, eight hundred fifty-six".