74428 has 12 divisors (see below), whose sum is σ = 136080. Its totient is φ = 35552.

The previous prime is 74419. The next prime is 74441. The reversal of 74428 is 82447.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

74428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313 + ... + 496.

It is an arithmetic number, because the mean of its divisors is an integer number (11340).

2⁷⁴⁴²⁸ is an apocalyptic number.

It is an amenable number.

74428 is a deficient number, since it is larger than the sum of its proper divisors (61652).

74428 is a wasteful number, since it uses less digits than its factorization.

74428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 834 counting only the distinct ones).

The product of its digits is 1792, while the sum is 25.

The square root of 74428 is about 272.8149556018. The cubic root of 74428 is about 42.0641498904.

It can be divided in two parts, 7442 and 8, that multiplied together give a square (59536 = 244²).

The spelling of 74428 in words is "seventy-four thousand, four hundred twenty-eight".