72507530 has 16 divisors (see below), whose sum is σ = 131245920. Its totient is φ = 28840272.

The previous prime is 72507527. The next prime is 72507577. The reversal of 72507530 is 3570527.

It is a super-3 number, since 3×72507530³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 72507493 and 72507502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18464 + ... + 22043.

It is an arithmetic number, because the mean of its divisors is an integer number (8202870).

Almost surely, 2^72507530 is an apocalyptic number.

72507530 is a deficient number, since it is larger than the sum of its proper divisors (58738390).

72507530 is a wasteful number, since it uses less digits than its factorization.

72507530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40693.

The product of its (nonzero) digits is 7350, while the sum is 29.

The square root of 72507530 is about 8515.1353483077. The cubic root of 72507530 is about 416.9919813206.

It can be divided in two parts, 72507 and 530, that added together give a palindrome (73037).

The spelling of 72507530 in words is "seventy-two million, five hundred seven thousand, five hundred thirty".