78875209 has 4 divisors (see below), whose sum is σ = 90143104. Its totient is φ = 67607316.

The previous prime is 78875207. The next prime is 78875227. The reversal of 78875209 is 90257887.

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 not a de Polignac number, because 78875209 - 2¹ = 78875207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78875207) 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, 5633937 + ... + 5633950.

It is an arithmetic number, because the mean of its divisors is an integer number (22535776).

Almost surely, 2^78875209 is an apocalyptic number.

It is an amenable number.

78875209 is a deficient number, since it is larger than the sum of its proper divisors (11267895).

78875209 is a wasteful number, since it uses less digits than its factorization.

78875209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11267894.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 78875209 is about 8881.1716006392. The cubic root of 78875209 is about 428.8579918765.

The spelling of 78875209 in words is "seventy-eight million, eight hundred seventy-five thousand, two hundred nine".