67640072 has 16 divisors (see below), whose sum is σ = 127280700. Its totient is φ = 33698560.

The previous prime is 67640063. The next prime is 67640077. The reversal of 67640072 is 27004676.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 67141636 + 498436 = 8194^2 + 706^2 .

It is not an unprimeable number, because it can be changed into a prime (67640077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12797 + ... + 17292.

Almost surely, 2^67640072 is an apocalyptic number.

It is an amenable number.

67640072 is a deficient number, since it is larger than the sum of its proper divisors (59640628).

67640072 is a wasteful number, since it uses less digits than its factorization.

67640072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30376 (or 30372 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 67640072 is about 8224.3584552231. The cubic root of 67640072 is about 407.4440878285. Note that the first 3 decimals are identical.

The spelling of 67640072 in words is "sixty-seven million, six hundred forty thousand, seventy-two".