78726019 has 8 divisors (see below), whose sum is σ = 81458048. Its totient is φ = 76006080.

The previous prime is 78726017. The next prime is 78726023. The reversal of 78726019 is 91062787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78726019 - 2¹ = 78726017 is a prime.

It is a super-2 number, since 2×78726019² = 12395572135176722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78726017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11389 + ... + 16945.

It is an arithmetic number, because the mean of its divisors is an integer number (10182256).

Almost surely, 2^78726019 is an apocalyptic number.

78726019 is a deficient number, since it is larger than the sum of its proper divisors (2732029).

78726019 is a wasteful number, since it uses less digits than its factorization.

78726019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 78726019 is about 8872.7683954897. The cubic root of 78726019 is about 428.5874307094.

The spelling of 78726019 in words is "seventy-eight million, seven hundred twenty-six thousand, nineteen".