67431487 has 4 divisors (see below), whose sum is σ = 68355280. Its totient is φ = 66507696.

The previous prime is 67431461. The next prime is 67431491. The reversal of 67431487 is 78413476.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67431487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67431407) 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 3 ways as a sum of consecutive naturals, for example, 461787 + ... + 461932.

It is an arithmetic number, because the mean of its divisors is an integer number (17088820).

Almost surely, 2^67431487 is an apocalyptic number.

67431487 is a deficient number, since it is larger than the sum of its proper divisors (923793).

67431487 is an equidigital number, since it uses as much as digits as its factorization.

67431487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923792.

The product of its digits is 112896, while the sum is 40.

The square root of 67431487 is about 8211.6677356065. The cubic root of 67431487 is about 407.0248381552.

The spelling of 67431487 in words is "sixty-seven million, four hundred thirty-one thousand, four hundred eighty-seven".