75457321 has 4 divisors (see below), whose sum is σ = 76149700. Its totient is φ = 74764944.

The previous prime is 75457313. The next prime is 75457331. The reversal of 75457321 is 12375457.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49843600 + 25613721 = 7060^2 + 5061^2 .

It is a cyclic number.

It is not a de Polignac number, because 75457321 - 2³ = 75457313 is a prime.

It is a super-3 number, since 3×75457321³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75457331) 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, 346026 + ... + 346243.

It is an arithmetic number, because the mean of its divisors is an integer number (19037425).

Almost surely, 2^75457321 is an apocalyptic number.

It is an amenable number.

75457321 is a deficient number, since it is larger than the sum of its proper divisors (692379).

75457321 is a wasteful number, since it uses less digits than its factorization.

75457321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692378.

The product of its digits is 29400, while the sum is 34.

The square root of 75457321 is about 8686.6173508449. The cubic root of 75457321 is about 422.5717507078.

The spelling of 75457321 in words is "seventy-five million, four hundred fifty-seven thousand, three hundred twenty-one".