67430721 has 8 divisors (see below), whose sum is σ = 95196384. Its totient is φ = 42309440.

The previous prime is 67430719. The next prime is 67430801. The reversal of 67430721 is 12703476.

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

It is a cyclic number.

It is not a de Polignac number, because 67430721 - 2¹ = 67430719 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (67430521) 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, 661035 + ... + 661136.

It is an arithmetic number, because the mean of its divisors is an integer number (11899548).

Almost surely, 2^67430721 is an apocalyptic number.

It is an amenable number.

67430721 is a deficient number, since it is larger than the sum of its proper divisors (27765663).

67430721 is a wasteful number, since it uses less digits than its factorization.

67430721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322191.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 67430721 is about 8211.6210945221. The cubic root of 67430721 is about 407.0232969256.

The spelling of 67430721 in words is "sixty-seven million, four hundred thirty thousand, seven hundred twenty-one".