78023919 has 4 divisors (see below), whose sum is σ = 104031896. Its totient is φ = 52015944.

The previous prime is 78023893. The next prime is 78023921. The reversal of 78023919 is 91932087.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78023919 - 2¹¹ = 78021871 is a prime.

It is a super-3 number, since 3×78023919³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78023989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13003984 + ... + 13003989.

It is an arithmetic number, because the mean of its divisors is an integer number (26007974).

Almost surely, 2^78023919 is an apocalyptic number.

78023919 is a deficient number, since it is larger than the sum of its proper divisors (26007977).

78023919 is a wasteful number, since it uses less digits than its factorization.

78023919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26007976.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 78023919 is about 8833.1149092492. The cubic root of 78023919 is about 427.3095379469.

The spelling of 78023919 in words is "seventy-eight million, twenty-three thousand, nine hundred nineteen".