78678019 has 8 divisors (see below), whose sum is σ = 90126080. Its totient is φ = 67282056.

The previous prime is 78678001. The next prime is 78678029. The reversal of 78678019 is 91087687.

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 78678019 - 2¹³ = 78669827 is a prime.

It is a super-2 number, since 2×78678019² = 12380461347528722, 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 78678019.

It is not an unprimeable number, because it can be changed into a prime (78678029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9729 + ... + 15874.

It is an arithmetic number, because the mean of its divisors is an integer number (11265760).

Almost surely, 2^78678019 is an apocalyptic number.

78678019 is a deficient number, since it is larger than the sum of its proper divisors (11448061).

78678019 is a wasteful number, since it uses less digits than its factorization.

78678019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26049.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 78678019 is about 8870.0630775660. The cubic root of 78678019 is about 428.5003083942.

The spelling of 78678019 in words is "seventy-eight million, six hundred seventy-eight thousand, nineteen".