67631761 has 2 divisors, whose sum is σ = 67631762. Its totient is φ = 67631760.

The previous prime is 67631719. The next prime is 67631777. The reversal of 67631761 is 16713676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40132225 + 27499536 = 6335^2 + 5244^2 .

It is a cyclic number.

It is not a de Polignac number, because 67631761 - 2¹¹ = 67629713 is a prime.

It is a super-2 number, since 2×67631761² = 9148110191922242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67631761.

It is not a weakly prime, because it can be changed into another prime (67631461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33815880 + 33815881.

It is an arithmetic number, because the mean of its divisors is an integer number (33815881).

Almost surely, 2^67631761 is an apocalyptic number.

It is an amenable number.

67631761 is a deficient number, since it is larger than the sum of its proper divisors (1).

67631761 is an equidigital number, since it uses as much as digits as its factorization.

67631761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 37.

The square root of 67631761 is about 8223.8531723274. The cubic root of 67631761 is about 407.4273994641.

The spelling of 67631761 in words is "sixty-seven million, six hundred thirty-one thousand, seven hundred sixty-one".