67864531 has 4 divisors (see below), whose sum is σ = 77559472. Its totient is φ = 58169592.

The previous prime is 67864529. The next prime is 67864541. The reversal of 67864531 is 13546876.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 67864531 - 2¹ = 67864529 is a prime.

It is a super-2 number, since 2×67864531² = 9211189135699922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67864541) 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, 4847460 + ... + 4847473.

It is an arithmetic number, because the mean of its divisors is an integer number (19389868).

Almost surely, 2^67864531 is an apocalyptic number.

67864531 is a deficient number, since it is larger than the sum of its proper divisors (9694941).

67864531 is an equidigital number, since it uses as much as digits as its factorization.

67864531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9694940.

The product of its digits is 120960, while the sum is 40.

The square root of 67864531 is about 8237.9931415364. The cubic root of 67864531 is about 407.8942820899.

The spelling of 67864531 in words is "sixty-seven million, eight hundred sixty-four thousand, five hundred thirty-one".