78522909 has 8 divisors (see below), whose sum is σ = 105624192. Its totient is φ = 51885120.

The previous prime is 78522901. The next prime is 78522931. The reversal of 78522909 is 90922587.

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

It is not a de Polignac number, because 78522909 - 2³ = 78522901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78522901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115477 + ... + 116154.

It is an arithmetic number, because the mean of its divisors is an integer number (13203024).

Almost surely, 2^78522909 is an apocalyptic number.

It is an amenable number.

78522909 is a deficient number, since it is larger than the sum of its proper divisors (27101283).

78522909 is a wasteful number, since it uses less digits than its factorization.

78522909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231747.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 78522909 is about 8861.3153086887. The cubic root of 78522909 is about 428.2185337685.

The spelling of 78522909 in words is "seventy-eight million, five hundred twenty-two thousand, nine hundred nine".