67399866 has 48 divisors (see below), whose sum is σ = 158828904. Its totient is φ = 20570112.

The previous prime is 67399853. The next prime is 67399873. The reversal of 67399866 is 66899376.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 58844241 + 8555625 = 7671^2 + 2925^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8346 + ... + 14298.

Almost surely, 2^67399866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67399866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79414452).

67399866 is an abundant number, since it is smaller than the sum of its proper divisors (91429038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67399866 is a wasteful number, since it uses less digits than its factorization.

67399866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6015 (or 6012 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 67399866 is about 8209.7421396777. The cubic root of 67399866 is about 406.9612054453.

It can be divided in two parts, 67399 and 866, that added together give a triangular number (68265 = T₃₆₉).

The spelling of 67399866 in words is "sixty-seven million, three hundred ninety-nine thousand, eight hundred sixty-six".