67720507 has 2 divisors, whose sum is σ = 67720508. Its totient is φ = 67720506.

The previous prime is 67720493. The next prime is 67720531. The reversal of 67720507 is 70502776.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67720507 is a prime.

It is not a weakly prime, because it can be changed into another prime (67720547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860253 + 33860254.

It is an arithmetic number, because the mean of its divisors is an integer number (33860254).

Almost surely, 2^67720507 is an apocalyptic number.

67720507 is a deficient number, since it is larger than the sum of its proper divisors (1).

67720507 is an equidigital number, since it uses as much as digits as its factorization.

67720507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 67720507 is about 8229.2470493964. The cubic root of 67720507 is about 407.6055295208.

The spelling of 67720507 in words is "sixty-seven million, seven hundred twenty thousand, five hundred seven".