78224009 has 8 divisors (see below), whose sum is σ = 80203200. Its totient is φ = 76252176.

The previous prime is 78223997. The next prime is 78224017. The reversal of 78224009 is 90042287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78224009 - 2⁴ = 78223993 is a prime.

It is a super-2 number, since 2×78224009² = 12237991168064162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78224039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24239 + ... + 27275.

It is an arithmetic number, because the mean of its divisors is an integer number (10025400).

Almost surely, 2^78224009 is an apocalyptic number.

It is an amenable number.

78224009 is a deficient number, since it is larger than the sum of its proper divisors (1979191).

78224009 is a wasteful number, since it uses less digits than its factorization.

78224009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 78224009 is about 8844.4337862862. The cubic root of 78224009 is about 427.6745003105.

The spelling of 78224009 in words is "seventy-eight million, two hundred twenty-four thousand, nine".