130731428 has 24 divisors (see below), whose sum is σ = 244023192. Its totient is φ = 61067264.

The previous prime is 130731427. The next prime is 130731431. The reversal of 130731428 is 824137031.

It can be written as a sum of positive squares in 4 ways, for example, as 16711744 + 114019684 = 4088^2 + 10678^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 130731428.

It is not an unprimeable number, because it can be changed into a prime (130731427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2300 + ... + 16332.

It is an arithmetic number, because the mean of its divisors is an integer number (10167633).

Almost surely, 2^130731428 is an apocalyptic number.

It is an amenable number.

130731428 is a deficient number, since it is larger than the sum of its proper divisors (113291764).

130731428 is a wasteful number, since it uses less digits than its factorization.

130731428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14191 (or 14189 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 130731428 is about 11433.7845003306. The cubic root of 130731428 is about 507.5279937967.

Adding to 130731428 its reverse (824137031), we get a palindrome (954868459).

The spelling of 130731428 in words is "one hundred thirty million, seven hundred thirty-one thousand, four hundred twenty-eight".