67638621 has 8 divisors (see below), whose sum is σ = 93094144. Its totient is φ = 43637760.

The previous prime is 67638611. The next prime is 67638629. The reversal of 67638621 is 12683676.

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

It is not a de Polignac number, because 67638621 - 2¹¹ = 67636573 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 67638621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67638629) 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, 363556 + ... + 363741.

It is an arithmetic number, because the mean of its divisors is an integer number (11636768).

Almost surely, 2^67638621 is an apocalyptic number.

It is an amenable number.

67638621 is a deficient number, since it is larger than the sum of its proper divisors (25455523).

67638621 is a wasteful number, since it uses less digits than its factorization.

67638621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727331.

The product of its digits is 72576, while the sum is 39.

The square root of 67638621 is about 8224.2702411825. The cubic root of 67638621 is about 407.4411743406.

The spelling of 67638621 in words is "sixty-seven million, six hundred thirty-eight thousand, six hundred twenty-one".