78375838 has 4 divisors (see below), whose sum is σ = 117563760. Its totient is φ = 39187918.

The previous prime is 78375833. The next prime is 78375839. The reversal of 78375838 is 83857387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83857387 = 31 ⋅2705077.

It is a super-2 number, since 2×78375838² = 12285543964404488, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 78375791 and 78375800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78375833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19593958 + ... + 19593961.

It is an arithmetic number, because the mean of its divisors is an integer number (29390940).

Almost surely, 2^78375838 is an apocalyptic number.

78375838 is a deficient number, since it is larger than the sum of its proper divisors (39187922).

78375838 is a wasteful number, since it uses less digits than its factorization.

78375838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39187921.

The product of its digits is 1128960, while the sum is 49.

The square root of 78375838 is about 8853.0129334594. The cubic root of 78375838 is about 427.9510199576.

The spelling of 78375838 in words is "seventy-eight million, three hundred seventy-five thousand, eight hundred thirty-eight".