245640130 has 16 divisors (see below), whose sum is σ = 443552760. Its totient is φ = 97944832.

The previous prime is 245640079. The next prime is 245640139. The reversal of 245640130 is 31046542.

It can be written as a sum of positive squares in 4 ways, for example, as 56385081 + 189255049 = 7509^2 + 13757^2 .

It is a junction number, because it is equal to n+sod(n) for n = 245640095 and 245640104.

It is not an unprimeable number, because it can be changed into a prime (245640139) 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 7 ways as a sum of consecutive naturals, for example, 35575 + ... + 41914.

Almost surely, 2^245640130 is an apocalyptic number.

245640130 is a deficient number, since it is larger than the sum of its proper divisors (197912630).

245640130 is a wasteful number, since it uses less digits than its factorization.

245640130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77813.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 245640130 is about 15672.9107060558. The cubic root of 245640130 is about 626.2769667924.

Adding to 245640130 its reverse (31046542), we get a palindrome (276686672).

The spelling of 245640130 in words is "two hundred forty-five million, six hundred forty thousand, one hundred thirty".