67721650 has 24 divisors (see below), whose sum is σ = 126218484. Its totient is φ = 27033600.

The previous prime is 67721597. The next prime is 67721653. The reversal of 67721650 is 5612776.

It can be written as a sum of positive squares in 6 ways, for example, as 15578809 + 52142841 = 3947^2 + 7221^2 .

It is not an unprimeable number, because it can be changed into a prime (67721653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30994 + ... + 33106.

Almost surely, 2^67721650 is an apocalyptic number.

67721650 is a deficient number, since it is larger than the sum of its proper divisors (58496834).

67721650 is a wasteful number, since it uses less digits than its factorization.

67721650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2766 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 67721650 is about 8229.3164965263. The cubic root of 67721650 is about 407.6078227233.

The spelling of 67721650 in words is "sixty-seven million, seven hundred twenty-one thousand, six hundred fifty".