67538421 has 16 divisors (see below), whose sum is σ = 101755200. Its totient is φ = 44261424.

The previous prime is 67538413. The next prime is 67538437. The reversal of 67538421 is 12483576.

It is not a de Polignac number, because 67538421 - 2³ = 67538413 is a prime.

It is a super-2 number, since 2×67538421² = 9122876622346482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67538441) 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 15 ways as a sum of consecutive naturals, for example, 19606 + ... + 22791.

It is an arithmetic number, because the mean of its divisors is an integer number (6359700).

Almost surely, 2^67538421 is an apocalyptic number.

It is an amenable number.

67538421 is a deficient number, since it is larger than the sum of its proper divisors (34216779).

67538421 is a wasteful number, since it uses less digits than its factorization.

67538421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42465 (or 42459 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 67538421 is about 8218.1762575404. The cubic root of 67538421 is about 407.2398801619.

The spelling of 67538421 in words is "sixty-seven million, five hundred thirty-eight thousand, four hundred twenty-one".