78083919 has 28 divisors (see below), whose sum is σ = 122188656. Its totient is φ = 49781952.

The previous prime is 78083899. The next prime is 78083969. The reversal of 78083919 is 91938087.

It is not a de Polignac number, because 78083919 - 2¹⁹ = 77559631 is a prime.

It is a super-2 number, since 2×78083919² = 12194196812797122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78083969) 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 27 ways as a sum of consecutive naturals, for example, 14439 + ... + 19095.

Almost surely, 2^78083919 is an apocalyptic number.

78083919 is the 5589-th heptagonal number.

78083919 is a deficient number, since it is larger than the sum of its proper divisors (44104737).

78083919 is an equidigital number, since it uses as much as digits as its factorization.

78083919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4698 (or 4683 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 78083919 is about 8836.5105669602. The cubic root of 78083919 is about 427.4190428416.

The spelling of 78083919 in words is "seventy-eight million, eighty-three thousand, nine hundred nineteen".