67320399 has 4 divisors (see below), whose sum is σ = 89760536. Its totient is φ = 44880264.

The previous prime is 67320389. The next prime is 67320419. The reversal of 67320399 is 99302376.

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

It is not a de Polignac number, because 67320399 - 2⁵ = 67320367 is a prime.

It is a super-2 number, since 2×67320399² = 9064072243038402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67320349) 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, 11220064 + ... + 11220069.

It is an arithmetic number, because the mean of its divisors is an integer number (22440134).

Almost surely, 2^67320399 is an apocalyptic number.

67320399 is a deficient number, since it is larger than the sum of its proper divisors (22440137).

67320399 is a wasteful number, since it uses less digits than its factorization.

67320399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22440136.

The product of its (nonzero) digits is 61236, while the sum is 39.

The square root of 67320399 is about 8204.9009134785. The cubic root of 67320399 is about 406.8012016432.

The spelling of 67320399 in words is "sixty-seven million, three hundred twenty thousand, three hundred ninety-nine".