78019019 has 12 divisors (see below), whose sum is σ = 87400800. Its totient is φ = 69529824.

The previous prime is 78019009. The next prime is 78019027. The reversal of 78019019 is 91091087.

It is a de Polignac number, because none of the positive numbers 2^k-78019019 is a prime.

It is a super-2 number, since 2×78019019² = 12173934651444722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78019019.

It is not an unprimeable number, because it can be changed into a prime (78019009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3059 + ... + 12860.

It is an arithmetic number, because the mean of its divisors is an integer number (7283400).

Almost surely, 2^78019019 is an apocalyptic number.

78019019 is a deficient number, since it is larger than the sum of its proper divisors (9381781).

78019019 is a wasteful number, since it uses less digits than its factorization.

78019019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15974 (or 15961 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 78019019 is about 8832.8375395453. The cubic root of 78019019 is about 427.3005925679.

The spelling of 78019019 in words is "seventy-eight million, nineteen thousand, nineteen".