13231482778 has 8 divisors (see below), whose sum is σ = 19890278100. Its totient is φ = 6601390080.

The previous prime is 13231482767. The next prime is 13231482787. The reversal of 13231482778 is 87728413231.

It can be written as a sum of positive squares in 2 ways, for example, as 10790431129 + 2441051649 = 103877^2 + 49407^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7174503 + ... + 7176346.

Almost surely, 2^13231482778 is an apocalyptic number.

13231482778 is a deficient number, since it is larger than the sum of its proper divisors (6658795322).

13231482778 is a wasteful number, since it uses less digits than its factorization.

13231482778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14351312.

The product of its digits is 451584, while the sum is 46.

The spelling of 13231482778 in words is "thirteen billion, two hundred thirty-one million, four hundred eighty-two thousand, seven hundred seventy-eight".