78738386 has 4 divisors (see below), whose sum is σ = 118107582. Its totient is φ = 39369192.

The previous prime is 78738383. The next prime is 78738397. The reversal of 78738386 is 68383787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68383787 = 3001 ⋅22787.

It can be written as a sum of positive squares in only one way, i.e., 70241161 + 8497225 = 8381^2 + 2915^2 .

It is not an unprimeable number, because it can be changed into a prime (78738383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19684595 + ... + 19684598.

Almost surely, 2^78738386 is an apocalyptic number.

78738386 is a deficient number, since it is larger than the sum of its proper divisors (39369196).

78738386 is a wasteful number, since it uses less digits than its factorization.

78738386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39369195.

The product of its digits is 1354752, while the sum is 50.

The square root of 78738386 is about 8873.4652757533. The cubic root of 78738386 is about 428.6098716732.

The spelling of 78738386 in words is "seventy-eight million, seven hundred thirty-eight thousand, three hundred eighty-six".