67828209 has 4 divisors (see below), whose sum is σ = 90437616. Its totient is φ = 45218804.

The previous prime is 67828207. The next prime is 67828223. The reversal of 67828209 is 90282876.

It is a happy number.

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 67828209 - 2¹ = 67828207 is a prime.

It is a super-2 number, since 2×67828209² = 9201331872295362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67828207) 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, 11304699 + ... + 11304704.

It is an arithmetic number, because the mean of its divisors is an integer number (22609404).

Almost surely, 2^67828209 is an apocalyptic number.

It is an amenable number.

67828209 is a deficient number, since it is larger than the sum of its proper divisors (22609407).

67828209 is a wasteful number, since it uses less digits than its factorization.

67828209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22609406.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 67828209 is about 8235.7883047101. The cubic root of 67828209 is about 407.8214989544.

The spelling of 67828209 in words is "sixty-seven million, eight hundred twenty-eight thousand, two hundred nine".