78945139 has 12 divisors (see below), whose sum is σ = 97698576. Its totient is φ = 62461152.

The previous prime is 78945137. The next prime is 78945149. The reversal of 78945139 is 93154987.

It is a happy number.

It is not a de Polignac number, because 78945139 - 2¹ = 78945137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78945137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32184 + ... + 34549.

It is an arithmetic number, because the mean of its divisors is an integer number (8141548).

Almost surely, 2^78945139 is an apocalyptic number.

78945139 is a deficient number, since it is larger than the sum of its proper divisors (18753437).

78945139 is a wasteful number, since it uses less digits than its factorization.

78945139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66766 (or 66753 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 78945139 is about 8885.1077089701. The cubic root of 78945139 is about 428.9846948932.

The spelling of 78945139 in words is "seventy-eight million, nine hundred forty-five thousand, one hundred thirty-nine".