75728917 has 4 divisors (see below), whose sum is σ = 82613376. Its totient is φ = 68844460.

The previous prime is 75728881. The next prime is 75728921. The reversal of 75728917 is 71982757.

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 a de Polignac number, because none of the positive numbers 2^k-75728917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75728017) 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, 3442213 + ... + 3442234.

It is an arithmetic number, because the mean of its divisors is an integer number (20653344).

Almost surely, 2^75728917 is an apocalyptic number.

It is an amenable number.

75728917 is a deficient number, since it is larger than the sum of its proper divisors (6884459).

75728917 is a wasteful number, since it uses less digits than its factorization.

75728917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6884458.

The product of its digits is 246960, while the sum is 46.

The square root of 75728917 is about 8702.2363217738. The cubic root of 75728917 is about 423.0781357448.

The spelling of 75728917 in words is "seventy-five million, seven hundred twenty-eight thousand, nine hundred seventeen".