67990906 has 8 divisors (see below), whose sum is σ = 105503220. Its totient is φ = 32823168.

The previous prime is 67990849. The next prime is 67990907. The reversal of 67990906 is 60909976.

It can be written as a sum of positive squares in 2 ways, for example, as 65755881 + 2235025 = 8109^2 + 1495^2 .

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

It is not an unprimeable number, because it can be changed into a prime (67990907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 586071 + ... + 586186.

Almost surely, 2^67990906 is an apocalyptic number.

67990906 is a deficient number, since it is larger than the sum of its proper divisors (37512314).

67990906 is a wasteful number, since it uses less digits than its factorization.

67990906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172288.

The product of its (nonzero) digits is 183708, while the sum is 46.

The square root of 67990906 is about 8245.6598280550. The cubic root of 67990906 is about 408.1473140024.

The spelling of 67990906 in words is "sixty-seven million, nine hundred ninety thousand, nine hundred six".