67428385 has 4 divisors (see below), whose sum is σ = 80914068. Its totient is φ = 53942704.

The previous prime is 67428377. The next prime is 67428391. The reversal of 67428385 is 58382476.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26173456 + 41254929 = 5116^2 + 6423^2 .

It is a cyclic number.

It is not a de Polignac number, because 67428385 - 2³ = 67428377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6742834 + ... + 6742843.

It is an arithmetic number, because the mean of its divisors is an integer number (20228517).

Almost surely, 2^67428385 is an apocalyptic number.

It is an amenable number.

67428385 is a deficient number, since it is larger than the sum of its proper divisors (13485683).

67428385 is a wasteful number, since it uses less digits than its factorization.

67428385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13485682.

The product of its digits is 322560, while the sum is 43.

The square root of 67428385 is about 8211.4788558456. The cubic root of 67428385 is about 407.0185967069.

The spelling of 67428385 in words is "sixty-seven million, four hundred twenty-eight thousand, three hundred eighty-five".