75978138 has 8 divisors (see below), whose sum is σ = 151956288. Its totient is φ = 25326044.

The previous prime is 75978137. The next prime is 75978163. The reversal of 75978138 is 83187957.

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

75978138 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (75978137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6331506 + ... + 6331517.

It is an arithmetic number, because the mean of its divisors is an integer number (18994536).

Almost surely, 2^75978138 is an apocalyptic number.

75978138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

75978138 is a wasteful number, since it uses less digits than its factorization.

75978138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12663028.

The product of its digits is 423360, while the sum is 48.

The square root of 75978138 is about 8716.5439252034. The cubic root of 75978138 is about 423.5417389272.

The spelling of 75978138 in words is "seventy-five million, nine hundred seventy-eight thousand, one hundred thirty-eight".