78080389 has 4 divisors (see below), whose sum is σ = 79896256. Its totient is φ = 76264524.

The previous prime is 78080381. The next prime is 78080407. The reversal of 78080389 is 98308087.

It is a happy number.

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 78080389 - 2³ = 78080381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1815823 = 78080389 / (7 + 8 + 0 + 8 + 0 + 3 + 8 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78080381) 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, 907869 + ... + 907954.

It is an arithmetic number, because the mean of its divisors is an integer number (19974064).

Almost surely, 2^78080389 is an apocalyptic number.

It is an amenable number.

78080389 is a deficient number, since it is larger than the sum of its proper divisors (1815867).

78080389 is a wasteful number, since it uses less digits than its factorization.

78080389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815866.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 78080389 is about 8836.3108252256. The cubic root of 78080389 is about 427.4126018570.

The spelling of 78080389 in words is "seventy-eight million, eighty thousand, three hundred eighty-nine".