78075838 has 4 divisors (see below), whose sum is σ = 117113760. Its totient is φ = 39037918.

The previous prime is 78075827. The next prime is 78075839. The reversal of 78075838 is 83857087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83857087 = 617 ⋅135911.

It is a super-4 number, since 4×78075838⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78075839) 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, 19518958 + ... + 19518961.

It is an arithmetic number, because the mean of its divisors is an integer number (29278440).

Almost surely, 2^78075838 is an apocalyptic number.

78075838 is a deficient number, since it is larger than the sum of its proper divisors (39037922).

78075838 is a wasteful number, since it uses less digits than its factorization.

78075838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39037921.

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 78075838 is about 8836.0533045020. The cubic root of 78075838 is about 427.4042976269.

The spelling of 78075838 in words is "seventy-eight million, seventy-five thousand, eight hundred thirty-eight".