75138761 has 4 divisors (see below), whose sum is σ = 77562624. Its totient is φ = 72714900.

The previous prime is 75138757. The next prime is 75138779. The reversal of 75138761 is 16783157.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75138761 - 2² = 75138757 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75138731) 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, 1211885 + ... + 1211946.

It is an arithmetic number, because the mean of its divisors is an integer number (19390656).

Almost surely, 2^75138761 is an apocalyptic number.

It is an amenable number.

75138761 is a deficient number, since it is larger than the sum of its proper divisors (2423863).

75138761 is a wasteful number, since it uses less digits than its factorization.

75138761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423862.

The product of its digits is 35280, while the sum is 38.

The square root of 75138761 is about 8668.2617057862. The cubic root of 75138761 is about 421.9762514431.

The spelling of 75138761 in words is "seventy-five million, one hundred thirty-eight thousand, seven hundred sixty-one".