78990319 has 4 divisors (see below), whose sum is σ = 79008160. Its totient is φ = 78972480.

The previous prime is 78990293. The next prime is 78990323. The reversal of 78990319 is 91309987.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91309987 = 449 ⋅203363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78990319 is a prime.

It is a super-2 number, since 2×78990319² = 12478940991443522, 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 (78910319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3322 + ... + 13000.

It is an arithmetic number, because the mean of its divisors is an integer number (19752040).

Almost surely, 2^78990319 is an apocalyptic number.

78990319 is a deficient number, since it is larger than the sum of its proper divisors (17841).

78990319 is an equidigital number, since it uses as much as digits as its factorization.

78990319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17840.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 78990319 is about 8887.6498018318. The cubic root of 78990319 is about 429.0665147182.

The spelling of 78990319 in words is "seventy-eight million, nine hundred ninety thousand, three hundred nineteen".