67539913 has 4 divisors (see below), whose sum is σ = 77188480. Its totient is φ = 57891348.

The previous prime is 67539887. The next prime is 67539919. The reversal of 67539913 is 31993576.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67539913 - 2⁹ = 67539401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67539913.

It is not an unprimeable number, because it can be changed into a prime (67539919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4824273 + ... + 4824286.

It is an arithmetic number, because the mean of its divisors is an integer number (19297120).

Almost surely, 2^67539913 is an apocalyptic number.

It is an amenable number.

67539913 is a deficient number, since it is larger than the sum of its proper divisors (9648567).

67539913 is an equidigital number, since it uses as much as digits as its factorization.

67539913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9648566.

The product of its digits is 153090, while the sum is 43.

The square root of 67539913 is about 8218.2670314367. The cubic root of 67539913 is about 407.2428789361.

The spelling of 67539913 in words is "sixty-seven million, five hundred thirty-nine thousand, nine hundred thirteen".