13431528 has 64 divisors (see below), whose sum is σ = 40708800. Its totient is φ = 4069440.

The previous prime is 13431521. The next prime is 13431533. The reversal of 13431528 is 82513431.

It is a happy number.

13431528 is a `hidden beast` number, since 134 + 3 + 1 + 528 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13431521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451 + ... + 5202.

It is an arithmetic number, because the mean of its divisors is an integer number (636075).

Almost surely, 2^13431528 is an apocalyptic number.

13431528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13431528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20354400).

13431528 is an abundant number, since it is smaller than the sum of its proper divisors (27277272).

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

13431528 is a wasteful number, since it uses less digits than its factorization.

13431528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5679 (or 5669 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 13431528 is about 3664.9049100898. The cubic root of 13431528 is about 237.7069103611.

Adding to 13431528 its reverse (82513431), we get a palindrome (95944959).

The spelling of 13431528 in words is "thirteen million, four hundred thirty-one thousand, five hundred twenty-eight".