74557 has 4 divisors (see below), whose sum is σ = 85216. Its totient is φ = 63900.

The previous prime is 74551. The next prime is 74561. The reversal of 74557 is 75547.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75547 = 31 ⋅2437.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74557 is a prime.

It is a super-3 number, since 3×74557³ = 1243330332260079, which contains 333 as substring.

It is a Duffinian 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 (74551) 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, 5319 + ... + 5332.

It is an arithmetic number, because the mean of its divisors is an integer number (21304).

2⁷⁴⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

74557 is a deficient number, since it is larger than the sum of its proper divisors (10659).

74557 is a wasteful number, since it uses less digits than its factorization.

74557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10658.

The product of its digits is 4900, while the sum is 28.

The square root of 74557 is about 273.0512772356. The cubic root of 74557 is about 42.0884379870.

Subtracting from 74557 its sum of digits (28), we obtain a square (74529 = 273²).

Subtracting 74557 from its reverse (75547), we obtain a triangular number (990 = T₄₄).

The spelling of 74557 in words is "seventy-four thousand, five hundred fifty-seven".