78322739 has 8 divisors (see below), whose sum is σ = 85529520. Its totient is φ = 71130400.

The previous prime is 78322721. The next prime is 78322753. The reversal of 78322739 is 93722387.

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

It is not a de Polignac number, because 78322739 - 2⁸ = 78322483 is a prime.

It is a super-2 number, since 2×78322739² = 12268902888924242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78322696 and 78322705.

It is not an unprimeable number, because it can be changed into a prime (78322789) 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 7 ways as a sum of consecutive naturals, for example, 9977 + ... + 16005.

It is an arithmetic number, because the mean of its divisors is an integer number (10691190).

Almost surely, 2^78322739 is an apocalyptic number.

78322739 is a deficient number, since it is larger than the sum of its proper divisors (7206781).

78322739 is a wasteful number, since it uses less digits than its factorization.

78322739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7221.

The product of its digits is 127008, while the sum is 41.

The square root of 78322739 is about 8850.0135028146. The cubic root of 78322739 is about 427.8543536659.

The spelling of 78322739 in words is "seventy-eight million, three hundred twenty-two thousand, seven hundred thirty-nine".