78197329 has 8 divisors (see below), whose sum is σ = 90073088. Its totient is φ = 66497760.

The previous prime is 78197323. The next prime is 78197351. The reversal of 78197329 is 92379187.

It is a happy number.

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

It is not a de Polignac number, because 78197329 - 2¹⁵ = 78164561 is a prime.

It is a super-2 number, since 2×78197329² = 12229644525468482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78197323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43092 + ... + 44869.

It is an arithmetic number, because the mean of its divisors is an integer number (11259136).

Almost surely, 2^78197329 is an apocalyptic number.

It is an amenable number.

78197329 is a deficient number, since it is larger than the sum of its proper divisors (11875759).

78197329 is a wasteful number, since it uses less digits than its factorization.

78197329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88095.

The product of its digits is 190512, while the sum is 46.

The square root of 78197329 is about 8842.9253643803. The cubic root of 78197329 is about 427.6258722174.

The spelling of 78197329 in words is "seventy-eight million, one hundred ninety-seven thousand, three hundred twenty-nine".