72705130 has 16 divisors (see below), whose sum is σ = 131705640. Its totient is φ = 28896192.

The previous prime is 72705119. The next prime is 72705133. The reversal of 72705130 is 3150727.

It can be written as a sum of positive squares in 4 ways, for example, as 61795321 + 10909809 = 7861^2 + 3303^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72705095 and 72705104.

It is not an unprimeable number, because it can be changed into a prime (72705133) 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, 21585 + ... + 24724.

Almost surely, 2^72705130 is an apocalyptic number.

72705130 is a deficient number, since it is larger than the sum of its proper divisors (59000510).

72705130 is a wasteful number, since it uses less digits than its factorization.

72705130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46473.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 72705130 is about 8526.7303229315. The cubic root of 72705130 is about 417.3704380027.

Adding to 72705130 its reverse (3150727), we get a palindrome (75855857).

The spelling of 72705130 in words is "seventy-two million, seven hundred five thousand, one hundred thirty".