78327389 has 16 divisors (see below), whose sum is σ = 90837120. Its totient is φ = 66156480.

The previous prime is 78327383. The next prime is 78327407. The reversal of 78327389 is 98372387.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78327389 - 2⁴ = 78327373 is a prime.

It is a super-2 number, since 2×78327389² = 12270359735114642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78327383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209807 + ... + 210179.

It is an arithmetic number, because the mean of its divisors is an integer number (5677320).

Almost surely, 2^78327389 is an apocalyptic number.

It is an amenable number.

78327389 is a deficient number, since it is larger than the sum of its proper divisors (12509731).

78327389 is a wasteful number, since it uses less digits than its factorization.

78327389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740.

The product of its digits is 508032, while the sum is 47.

The square root of 78327389 is about 8850.2762103790. The cubic root of 78327389 is about 427.8628206977.

The spelling of 78327389 in words is "seventy-eight million, three hundred twenty-seven thousand, three hundred eighty-nine".