13780404864 has 48 divisors (see below), whose sum is σ = 39654553770. Its totient is φ = 4593467904.

The previous prime is 13780404863. The next prime is 13780404871. The reversal of 13780404864 is 46840408731.

It can be written as a sum of positive squares in only one way, i.e., 7602444864 + 6177960000 = 87192^2 + 78600^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (13780404863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5979927 + ... + 5982230.

Almost surely, 2^13780404864 is an apocalyptic number.

It is an amenable number.

13780404864 is an abundant number, since it is smaller than the sum of its proper divisors (25874148906).

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

13780404864 is a wasteful number, since it uses less digits than its factorization.

13780404864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11962177 (or 11962162 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 13780404864 in words is "thirteen billion, seven hundred eighty million, four hundred four thousand, eight hundred sixty-four".