72529645 has 4 divisors (see below), whose sum is σ = 87035580. Its totient is φ = 58023712.

The previous prime is 72529637. The next prime is 72529651. The reversal of 72529645 is 54692527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49364676 + 23164969 = 7026^2 + 4813^2 .

It is a cyclic number.

It is not a de Polignac number, because 72529645 - 2³ = 72529637 is a prime.

It is a super-3 number, since 3×72529645³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 72529598 and 72529607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7252960 + ... + 7252969.

It is an arithmetic number, because the mean of its divisors is an integer number (21758895).

Almost surely, 2^72529645 is an apocalyptic number.

It is an amenable number.

72529645 is a deficient number, since it is larger than the sum of its proper divisors (14505935).

72529645 is a wasteful number, since it uses less digits than its factorization.

72529645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14505934.

The product of its digits is 151200, while the sum is 40.

The square root of 72529645 is about 8516.4338193871. The cubic root of 72529645 is about 417.0343715857.

The spelling of 72529645 in words is "seventy-two million, five hundred twenty-nine thousand, six hundred forty-five".