75709221 has 8 divisors (see below), whose sum is σ = 115366464. Its totient is φ = 43262400.

The previous prime is 75709219. The next prime is 75709229. The reversal of 75709221 is 12290757.

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

It is not a de Polignac number, because 75709221 - 2¹ = 75709219 is a prime.

It is a super-2 number, since 2×75709221² = 11463772288853682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75709229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1802580 + ... + 1802621.

It is an arithmetic number, because the mean of its divisors is an integer number (14420808).

Almost surely, 2^75709221 is an apocalyptic number.

It is an amenable number.

75709221 is a deficient number, since it is larger than the sum of its proper divisors (39657243).

75709221 is a wasteful number, since it uses less digits than its factorization.

75709221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605211.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 75709221 is about 8701.1045850513. The cubic root of 75709221 is about 423.0414537224.

Adding to 75709221 its reverse (12290757), we get a palindrome (87999978).

The spelling of 75709221 in words is "seventy-five million, seven hundred nine thousand, two hundred twenty-one".