67720493 has 2 divisors, whose sum is σ = 67720494. Its totient is φ = 67720492.

The previous prime is 67720489. The next prime is 67720507. The reversal of 67720493 is 39402776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63792169 + 3928324 = 7987^2 + 1982^2 .

It is a cyclic number.

It is not a de Polignac number, because 67720493 - 2² = 67720489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67720403) 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 as a sum of consecutive naturals, namely, 33860246 + 33860247.

It is an arithmetic number, because the mean of its divisors is an integer number (33860247).

Almost surely, 2^67720493 is an apocalyptic number.

It is an amenable number.

67720493 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720493 is an equidigital number, since it uses as much as digits as its factorization.

67720493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 67720493 is about 8229.2461987718. The cubic root of 67720493 is about 407.6055014324.

The spelling of 67720493 in words is "sixty-seven million, seven hundred twenty thousand, four hundred ninety-three".