78393129 has 4 divisors (see below), whose sum is σ = 104524176. Its totient is φ = 52262084.

The previous prime is 78393109. The next prime is 78393143. The reversal of 78393129 is 92139387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78393129 - 2¹² = 78389033 is a prime.

It is a super-2 number, since 2×78393129² = 12290965348821282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78393109) 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 3 ways as a sum of consecutive naturals, for example, 13065519 + ... + 13065524.

It is an arithmetic number, because the mean of its divisors is an integer number (26131044).

Almost surely, 2^78393129 is an apocalyptic number.

It is an amenable number.

78393129 is a deficient number, since it is larger than the sum of its proper divisors (26131047).

78393129 is a wasteful number, since it uses less digits than its factorization.

78393129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26131046.

The product of its digits is 81648, while the sum is 42.

The square root of 78393129 is about 8853.9894397949. The cubic root of 78393129 is about 427.9824886567.

The spelling of 78393129 in words is "seventy-eight million, three hundred ninety-three thousand, one hundred twenty-nine".