67649537 has 2 divisors, whose sum is σ = 67649538. Its totient is φ = 67649536.

The previous prime is 67649521. The next prime is 67649539. The reversal of 67649537 is 73594676.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66324736 + 1324801 = 8144^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 67649537 - 2⁴ = 67649521 is a prime.

Together with 67649539, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 67649491 and 67649500.

It is not a weakly prime, because it can be changed into another prime (67649539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33824768 + 33824769.

It is an arithmetic number, because the mean of its divisors is an integer number (33824769).

It is a Proth number, since it is equal to 4129 ⋅ 2¹⁴ + 1 and 4129 < 2¹⁴.

Almost surely, 2^67649537 is an apocalyptic number.

It is an amenable number.

67649537 is a deficient number, since it is larger than the sum of its proper divisors (1).

67649537 is an equidigital number, since it uses as much as digits as its factorization.

67649537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 47.

The square root of 67649537 is about 8224.9338599164. The cubic root of 67649537 is about 407.4630917430.

It can be divided in two parts, 67649 and 537, that added together give a palindrome (68186).

The spelling of 67649537 in words is "sixty-seven million, six hundred forty-nine thousand, five hundred thirty-seven".