551428 has 12 divisors (see below), whose sum is σ = 996352. Its totient is φ = 266760.

The previous prime is 551423. The next prime is 551443. The reversal of 551428 is 824155.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (551423) by changing a digit.

551428 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, 2100 + ... + 2347.

2⁵⁵¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

551428 is a deficient number, since it is larger than the sum of its proper divisors (444924).

551428 is a wasteful number, since it uses less digits than its factorization.

551428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482 (or 4480 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 551428 is about 742.5819820060. The cubic root of 551428 is about 82.0029743121.

It can be divided in two parts, 551 and 428, that added together give a palindrome (979).

The spelling of 551428 in words is "five hundred fifty-one thousand, four hundred twenty-eight".