67844738421 has 24 divisors (see below), whose sum is σ = 100201221120. Its totient is φ = 44224171776.

The previous prime is 67844738389. The next prime is 67844738483. The reversal of 67844738421 is 12483744876.

67844738421 is a `hidden beast` number, since 6 + 78 + 4 + 473 + 84 + 21 = 666.

It is not a de Polignac number, because 67844738421 - 2⁵ = 67844738389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67844738821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 395701 + ... + 540618.

It is an arithmetic number, because the mean of its divisors is an integer number (4175050880).

Almost surely, 2^67844738421 is an apocalyptic number.

It is an amenable number.

67844738421 is a deficient number, since it is larger than the sum of its proper divisors (32356482699).

67844738421 is a wasteful number, since it uses less digits than its factorization.

67844738421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936505 (or 936502 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 54.

The spelling of 67844738421 in words is "sixty-seven billion, eight hundred forty-four million, seven hundred thirty-eight thousand, four hundred twenty-one".