67642385 has 4 divisors (see below), whose sum is σ = 81170868. Its totient is φ = 54113904.

The previous prime is 67642381. The next prime is 67642387. The reversal of 67642385 is 58324676.

It is a happy number.

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 11587216 + 56055169 = 3404^2 + 7487^2 .

It is a cyclic number.

It is not a de Polignac number, because 67642385 - 2² = 67642381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67642381) 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, 6764234 + ... + 6764243.

It is an arithmetic number, because the mean of its divisors is an integer number (20292717).

Almost surely, 2^67642385 is an apocalyptic number.

It is an amenable number.

67642385 is a deficient number, since it is larger than the sum of its proper divisors (13528483).

67642385 is a wasteful number, since it uses less digits than its factorization.

67642385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13528482.

The product of its digits is 241920, while the sum is 41.

The square root of 67642385 is about 8224.4990728919. The cubic root of 67642385 is about 407.4487320550.

The spelling of 67642385 in words is "sixty-seven million, six hundred forty-two thousand, three hundred eighty-five".