78638078 has 8 divisors (see below), whose sum is σ = 117995520. Its totient is φ = 39306240.

The previous prime is 78638057. The next prime is 78638117. The reversal of 78638078 is 87083687.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6398 + ... + 14078.

It is an arithmetic number, because the mean of its divisors is an integer number (14749440).

Almost surely, 2^78638078 is an apocalyptic number.

78638078 is a deficient number, since it is larger than the sum of its proper divisors (39357442).

78638078 is a wasteful number, since it uses less digits than its factorization.

78638078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12802.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 78638078 is about 8867.8113421520. The cubic root of 78638078 is about 428.4277865389.

The spelling of 78638078 in words is "seventy-eight million, six hundred thirty-eight thousand, seventy-eight".