68630721 has 8 divisors (see below), whose sum is σ = 91559424. Its totient is φ = 45727920.

The previous prime is 68630687. The next prime is 68630729. The reversal of 68630721 is 12703686.

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

It is not a de Polignac number, because 68630721 - 2⁷ = 68630593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68630729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 915 + ... + 11751.

It is an arithmetic number, because the mean of its divisors is an integer number (11444928).

Almost surely, 2^68630721 is an apocalyptic number.

It is an amenable number.

68630721 is a deficient number, since it is larger than the sum of its proper divisors (22928703).

68630721 is a wasteful number, since it uses less digits than its factorization.

68630721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12951.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 68630721 is about 8284.3660590295. The cubic root of 68630721 is about 409.4235822226.

The spelling of 68630721 in words is "sixty-eight million, six hundred thirty thousand, seven hundred twenty-one".