13778328531 has 8 divisors (see below), whose sum is σ = 20041205184. Its totient is φ = 8350502120.

The previous prime is 13778328527. The next prime is 13778328563. The reversal of 13778328531 is 13582387731.

13778328531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 13778328531 - 2² = 13778328527 is a prime.

It is a super-2 number, since 2×13778328531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13778328131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208762521 + ... + 208762586.

It is an arithmetic number, because the mean of its divisors is an integer number (2505150648).

Almost surely, 2^13778328531 is an apocalyptic number.

13778328531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13778328531 is a deficient number, since it is larger than the sum of its proper divisors (6262876653).

13778328531 is a wasteful number, since it uses less digits than its factorization.

13778328531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417525121.

The product of its digits is 846720, while the sum is 48.

The spelling of 13778328531 in words is "thirteen billion, seven hundred seventy-eight million, three hundred twenty-eight thousand, five hundred thirty-one".