78909429 has 16 divisors (see below), whose sum is σ = 108399104. Its totient is φ = 51030000.

The previous prime is 78909371. The next prime is 78909431. The reversal of 78909429 is 92490987.

It is a happy number.

It is not a de Polignac number, because 78909429 - 2¹³ = 78901237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78909449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17454 + ... + 21504.

It is an arithmetic number, because the mean of its divisors is an integer number (6774944).

Almost surely, 2^78909429 is an apocalyptic number.

It is an amenable number.

78909429 is a deficient number, since it is larger than the sum of its proper divisors (29489675).

78909429 is a wasteful number, since it uses less digits than its factorization.

78909429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 78909429 is about 8883.0979393453. The cubic root of 78909429 is about 428.9200029057.

The spelling of 78909429 in words is "seventy-eight million, nine hundred nine thousand, four hundred twenty-nine".