72130175770 has 16 divisors (see below), whose sum is σ = 133343352648. Its totient is φ = 28072284480.

The previous prime is 72130175759. The next prime is 72130175773. The reversal of 72130175770 is 7757103127.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48663918801 + 23466256969 = 220599^2 + 153187^2 .

It is a super-2 number, since 2×72130175770² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72130175773) 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, 97472841 + ... + 97473580.

Almost surely, 2^72130175770 is an apocalyptic number.

72130175770 is a deficient number, since it is larger than the sum of its proper divisors (61213176878).

72130175770 is a wasteful number, since it uses less digits than its factorization.

72130175770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194946465.

The product of its (nonzero) digits is 72030, while the sum is 40.

Adding to 72130175770 its reverse (7757103127), we get a palindrome (79887278897).

The spelling of 72130175770 in words is "seventy-two billion, one hundred thirty million, one hundred seventy-five thousand, seven hundred seventy".