75508139 has 4 divisors (see below), whose sum is σ = 86295024. Its totient is φ = 64721256.

The previous prime is 75508127. The next prime is 75508159. The reversal of 75508139 is 93180557.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93180557 = 349 ⋅266993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75508139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75508159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5393432 + ... + 5393445.

It is an arithmetic number, because the mean of its divisors is an integer number (21573756).

Almost surely, 2^75508139 is an apocalyptic number.

75508139 is a deficient number, since it is larger than the sum of its proper divisors (10786885).

75508139 is a wasteful number, since it uses less digits than its factorization.

75508139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10786884.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 75508139 is about 8689.5419326913. The cubic root of 75508139 is about 422.6665921007. Note that the first 3 decimals are identical.

The spelling of 75508139 in words is "seventy-five million, five hundred eight thousand, one hundred thirty-nine".