67640245 has 8 divisors (see below), whose sum is σ = 81469440. Its totient is φ = 53911440.

The previous prime is 67640231. The next prime is 67640249. The reversal of 67640245 is 54204676.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67640245 - 2⁵ = 67640213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67640245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67640249) 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 7 ways as a sum of consecutive naturals, for example, 23605 + ... + 26314.

It is an arithmetic number, because the mean of its divisors is an integer number (10183680).

Almost surely, 2^67640245 is an apocalyptic number.

It is an amenable number.

67640245 is a deficient number, since it is larger than the sum of its proper divisors (13829195).

67640245 is a wasteful number, since it uses less digits than its factorization.

67640245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50195.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 67640245 is about 8224.3689727541. The cubic root of 67640245 is about 407.4444351954. Note that the first 4 decimals are identical.

The spelling of 67640245 in words is "sixty-seven million, six hundred forty thousand, two hundred forty-five".