617428 has 12 divisors (see below), whose sum is σ = 1234912. Its totient is φ = 264600.

The previous prime is 617411. The next prime is 617429. The reversal of 617428 is 824716.

617428 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 22051 = 617428 / (6 + 1 + 7 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 617396 and 617405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (617429) by changing a digit.

617428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 10998 + ... + 11053.

2⁶¹⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

617428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

617428 is a wasteful number, since it uses less digits than its factorization.

617428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22062 (or 22060 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 617428 is about 785.7658684366. The cubic root of 617428 is about 85.1521151571.

The spelling of 617428 in words is "six hundred seventeen thousand, four hundred twenty-eight".