67992905 has 8 divisors (see below), whose sum is σ = 83131272. Its totient is φ = 53367808.

The previous prime is 67992901. The next prime is 67992913. The reversal of 67992905 is 50929976.

It can be written as a sum of positive squares in 4 ways, for example, as 3286969 + 64705936 = 1813^2 + 8044^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 67992905 - 2² = 67992901 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67992905.

It is not an unprimeable number, because it can be changed into a prime (67992901) 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 7 ways as a sum of consecutive naturals, for example, 128024 + ... + 128553.

It is an arithmetic number, because the mean of its divisors is an integer number (10391409).

Almost surely, 2^67992905 is an apocalyptic number.

It is an amenable number.

67992905 is a deficient number, since it is larger than the sum of its proper divisors (15138367).

67992905 is a wasteful number, since it uses less digits than its factorization.

67992905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256635.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 67992905 is about 8245.7810424483. The cubic root of 67992905 is about 408.1513139416.

The spelling of 67992905 in words is "sixty-seven million, nine hundred ninety-two thousand, nine hundred five".