130428 has 18 divisors (see below), whose sum is σ = 329784. Its totient is φ = 43464.

The previous prime is 130423. The next prime is 130439. The reversal of 130428 is 824031.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×130428² = 34022926368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 130428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1776 + ... + 1847.

2¹³⁰⁴²⁸ is an apocalyptic number.

130428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

130428 is an abundant number, since it is smaller than the sum of its proper divisors (199356).

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

130428 is a wasteful number, since it uses less digits than its factorization.

130428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3633 (or 3628 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 130428 is about 361.1481690387. The cubic root of 130428 is about 50.7135031666.

Adding to 130428 its reverse (824031), we get a palindrome (954459).

The spelling of 130428 in words is "one hundred thirty thousand, four hundred twenty-eight".