75247 has 4 divisors (see below), whose sum is σ = 76896. Its totient is φ = 73600.

The previous prime is 75239. The next prime is 75253. The reversal of 75247 is 74257.

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

It is a cyclic number.

It is not a de Polignac number, because 75247 - 2³ = 75239 is a prime.

It is a super-2 number, since 2×75247² = 11324222018, which contains 22 as substring.

It is a Duffinian number.

75247 is a lucky number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754 + ... + 847.

It is an arithmetic number, because the mean of its divisors is an integer number (19224).

2⁷⁵²⁴⁷ is an apocalyptic number.

75247 is a deficient number, since it is larger than the sum of its proper divisors (1649).

75247 is a wasteful number, since it uses less digits than its factorization.

75247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648.

The product of its digits is 1960, while the sum is 25.

The square root of 75247 is about 274.3118663128. The cubic root of 75247 is about 42.2178776180.

Subtracting from 75247 its reverse (74257), we obtain a triangular number (990 = T₄₄).

It can be divided in two parts, 752 and 47, that multiplied together give a square (35344 = 188²).

The spelling of 75247 in words is "seventy-five thousand, two hundred forty-seven".