75712321 has 4 divisors (see below), whose sum is σ = 79697200. Its totient is φ = 71727444.

The previous prime is 75712309. The next prime is 75712331. The reversal of 75712321 is 12321757.

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 75712321 - 2¹⁵ = 75679553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75712321.

It is not an unprimeable number, because it can be changed into a prime (75712331) 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, 1992411 + ... + 1992448.

It is an arithmetic number, because the mean of its divisors is an integer number (19924300).

Almost surely, 2^75712321 is an apocalyptic number.

It is an amenable number.

75712321 is a deficient number, since it is larger than the sum of its proper divisors (3984879).

75712321 is a wasteful number, since it uses less digits than its factorization.

75712321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3984878.

The product of its digits is 2940, while the sum is 28.

The square root of 75712321 is about 8701.2827215302. The cubic root of 75712321 is about 423.0472276144.

The spelling of 75712321 in words is "seventy-five million, seven hundred twelve thousand, three hundred twenty-one".