67625729 has 2 divisors, whose sum is σ = 67625730. Its totient is φ = 67625728.

The previous prime is 67625717. The next prime is 67625743. The reversal of 67625729 is 92752676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65529025 + 2096704 = 8095^2 + 1448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67625729 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67625729.

It is not a weakly prime, because it can be changed into another prime (67625429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33812864 + 33812865.

It is an arithmetic number, because the mean of its divisors is an integer number (33812865).

Almost surely, 2^67625729 is an apocalyptic number.

It is an amenable number.

67625729 is a deficient number, since it is larger than the sum of its proper divisors (1).

67625729 is an equidigital number, since it uses as much as digits as its factorization.

67625729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 67625729 is about 8223.4864260847. The cubic root of 67625729 is about 407.4152864415.

The spelling of 67625729 in words is "sixty-seven million, six hundred twenty-five thousand, seven hundred twenty-nine".