67373721 has 8 divisors (see below), whose sum is σ = 99812960. Its totient is φ = 44915796.

The previous prime is 67373711. The next prime is 67373729. The reversal of 67373721 is 12737376.

It is not a de Polignac number, because 67373721 - 2¹¹ = 67371673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67373729) 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, 1247635 + ... + 1247688.

It is an arithmetic number, because the mean of its divisors is an integer number (12476620).

Almost surely, 2^67373721 is an apocalyptic number.

It is an amenable number.

67373721 is a deficient number, since it is larger than the sum of its proper divisors (32439239).

67373721 is a wasteful number, since it uses less digits than its factorization.

67373721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495332 (or 2495326 counting only the distinct ones).

The product of its digits is 37044, while the sum is 36.

The square root of 67373721 is about 8208.1496696880. The cubic root of 67373721 is about 406.9085773644.

The spelling of 67373721 in words is "sixty-seven million, three hundred seventy-three thousand, seven hundred twenty-one".