78678993 has 8 divisors (see below), whose sum is σ = 105706656. Its totient is φ = 52052000.

The previous prime is 78678989. The next prime is 78679033. The reversal of 78678993 is 39987687.

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 78678993 - 2² = 78678989 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78678973) 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, 99708 + ... + 100493.

It is an arithmetic number, because the mean of its divisors is an integer number (13213332).

Almost surely, 2^78678993 is an apocalyptic number.

It is an amenable number.

78678993 is a deficient number, since it is larger than the sum of its proper divisors (27027663).

78678993 is a wasteful number, since it uses less digits than its factorization.

78678993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200335.

The product of its digits is 4572288, while the sum is 57.

The square root of 78678993 is about 8870.1179811770. The cubic root of 78678993 is about 428.5020766034.

The spelling of 78678993 in words is "seventy-eight million, six hundred seventy-eight thousand, nine hundred ninety-three".