78308338 has 4 divisors (see below), whose sum is σ = 117462510. Its totient is φ = 39154168.

The previous prime is 78308333. The next prime is 78308359. The reversal of 78308338 is 83380387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75394489 + 2913849 = 8683^2 + 1707^2 .

It is a super-2 number, since 2×78308338² = 12264391600644488, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 78308338.

It is not an unprimeable number, because it can be changed into a prime (78308333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19577083 + ... + 19577086.

Almost surely, 2^78308338 is an apocalyptic number.

78308338 is a deficient number, since it is larger than the sum of its proper divisors (39154172).

78308338 is a wasteful number, since it uses less digits than its factorization.

78308338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39154171.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 78308338 is about 8849.1998508340. The cubic root of 78308338 is about 427.8281292331.

The spelling of 78308338 in words is "seventy-eight million, three hundred eight thousand, three hundred thirty-eight".