67478399 has 2 divisors, whose sum is σ = 67478400. Its totient is φ = 67478398.

The previous prime is 67478387. The next prime is 67478401. The reversal of 67478399 is 99387476.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67478399 is a prime.

Together with 67478401, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67478399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67478339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33739199 + 33739200.

It is an arithmetic number, because the mean of its divisors is an integer number (33739200).

Almost surely, 2^67478399 is an apocalyptic number.

67478399 is a deficient number, since it is larger than the sum of its proper divisors (1).

67478399 is an equidigital number, since it uses as much as digits as its factorization.

67478399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 53.

The square root of 67478399 is about 8214.5236623921. The cubic root of 67478399 is about 407.1192051628.

The spelling of 67478399 in words is "sixty-seven million, four hundred seventy-eight thousand, three hundred ninety-nine".