67720753 has 2 divisors, whose sum is σ = 67720754. Its totient is φ = 67720752.

The previous prime is 67720747. The next prime is 67720781. The reversal of 67720753 is 35702776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66064384 + 1656369 = 8128^2 + 1287^2 .

It is a cyclic number.

It is not a de Polignac number, because 67720753 - 2⁵ = 67720721 is a prime.

It is a super-3 number, since 3×67720753³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (67720703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860376 + 33860377.

It is an arithmetic number, because the mean of its divisors is an integer number (33860377).

Almost surely, 2^67720753 is an apocalyptic number.

It is an amenable number.

67720753 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720753 is an equidigital number, since it uses as much as digits as its factorization.

67720753 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61740, while the sum is 37.

The square root of 67720753 is about 8229.2619960723. The cubic root of 67720753 is about 407.6060230731.

The spelling of 67720753 in words is "sixty-seven million, seven hundred twenty thousand, seven hundred fifty-three".