67721441 has 2 divisors, whose sum is σ = 67721442. Its totient is φ = 67721440.

The previous prime is 67721419. The next prime is 67721449. The reversal of 67721441 is 14412776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53875600 + 13845841 = 7340^2 + 3721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67721441 is a prime.

It is a super-2 number, since 2×67721441² = 9172387142232962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67721398 and 67721407.

It is not a weakly prime, because it can be changed into another prime (67721449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33860720 + 33860721.

It is an arithmetic number, because the mean of its divisors is an integer number (33860721).

Almost surely, 2^67721441 is an apocalyptic number.

It is an amenable number.

67721441 is a deficient number, since it is larger than the sum of its proper divisors (1).

67721441 is an equidigital number, since it uses as much as digits as its factorization.

67721441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 32.

The square root of 67721441 is about 8229.3037980135. The cubic root of 67721441 is about 407.6074034082.

The spelling of 67721441 in words is "sixty-seven million, seven hundred twenty-one thousand, four hundred forty-one".