67505421 has 8 divisors (see below), whose sum is σ = 91146880. Its totient is φ = 44433792.

The previous prime is 67505413. The next prime is 67505429. The reversal of 67505421 is 12450576.

It is an interprime number because it is at equal distance from previous prime (67505413) and next prime (67505429).

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

It is not a de Polignac number, because 67505421 - 2³ = 67505413 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 (67505429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142180 + ... + 142653.

It is an arithmetic number, because the mean of its divisors is an integer number (11393360).

Almost surely, 2^67505421 is an apocalyptic number.

It is an amenable number.

67505421 is a deficient number, since it is larger than the sum of its proper divisors (23641459).

67505421 is a wasteful number, since it uses less digits than its factorization.

67505421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284915.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 67505421 is about 8216.1682675077. The cubic root of 67505421 is about 407.1735420922.

Adding to 67505421 its reverse (12450576), we get a palindrome (79955997).

The spelling of 67505421 in words is "sixty-seven million, five hundred five thousand, four hundred twenty-one".