75138609 has 64 divisors (see below), whose sum is σ = 129830400. Its totient is φ = 38384640.

The previous prime is 75138563. The next prime is 75138629. The reversal of 75138609 is 90683157.

It is not a de Polignac number, because 75138609 - 2⁸ = 75138353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (75138629) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 548389 + ... + 548525.

It is an arithmetic number, because the mean of its divisors is an integer number (2028600).

Almost surely, 2^75138609 is an apocalyptic number.

It is an amenable number.

75138609 is a deficient number, since it is larger than the sum of its proper divisors (54691791).

75138609 is a wasteful number, since it uses less digits than its factorization.

75138609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 75138609 is about 8668.2529381646. The cubic root of 75138609 is about 421.9759669010.

The spelling of 75138609 in words is "seventy-five million, one hundred thirty-eight thousand, six hundred nine".