67051649 has 6 divisors (see below), whose sum is σ = 77998914. Its totient is φ = 57472800.

The previous prime is 67051643. The next prime is 67051651. The reversal of 67051649 is 94615076.

67051649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 65934400 + 1117249 = 8120^2 + 1057^2 .

It is a de Polignac number, because none of the positive numbers 2^k-67051649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67051643) 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 in 5 ways as a sum of consecutive naturals, for example, 684152 + ... + 684249.

It is an arithmetic number, because the mean of its divisors is an integer number (12999819).

Almost surely, 2^67051649 is an apocalyptic number.

It is an amenable number.

67051649 is a deficient number, since it is larger than the sum of its proper divisors (10947265).

67051649 is a wasteful number, since it uses less digits than its factorization.

67051649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368415 (or 1368408 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 67051649 is about 8188.5071288972. The cubic root of 67051649 is about 406.2591488591.

The spelling of 67051649 in words is "sixty-seven million, fifty-one thousand, six hundred forty-nine".