67572409 has 4 divisors (see below), whose sum is σ = 67589200. Its totient is φ = 67555620.

The previous prime is 67572391. The next prime is 67572419. The reversal of 67572409 is 90427576.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67572409 - 2¹¹ = 67570361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67572419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1642 + ... + 11740.

It is an arithmetic number, because the mean of its divisors is an integer number (16897300).

Almost surely, 2^67572409 is an apocalyptic number.

It is an amenable number.

67572409 is a deficient number, since it is larger than the sum of its proper divisors (16791).

67572409 is a wasteful number, since it uses less digits than its factorization.

67572409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16790.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 67572409 is about 8220.2438528306. The cubic root of 67572409 is about 407.3081817679.

The spelling of 67572409 in words is "sixty-seven million, five hundred seventy-two thousand, four hundred nine".