78945329 has 4 divisors (see below), whose sum is σ = 78963300. Its totient is φ = 78927360.

The previous prime is 78945319. The next prime is 78945343. The reversal of 78945329 is 92354987.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20070400 + 58874929 = 4480^2 + 7673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78945329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78945319) 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, 2489 + ... + 12809.

It is an arithmetic number, because the mean of its divisors is an integer number (19740825).

Almost surely, 2^78945329 is an apocalyptic number.

It is an amenable number.

78945329 is a deficient number, since it is larger than the sum of its proper divisors (17971).

78945329 is a wasteful number, since it uses less digits than its factorization.

78945329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17970.

The product of its digits is 544320, while the sum is 47.

The square root of 78945329 is about 8885.1184010119. The cubic root of 78945329 is about 428.9850390437.

The spelling of 78945329 in words is "seventy-eight million, nine hundred forty-five thousand, three hundred twenty-nine".