72506452 has 6 divisors (see below), whose sum is σ = 126886298. Its totient is φ = 36253224.

The previous prime is 72506449. The next prime is 72506453. The reversal of 72506452 is 25460527.

It can be written as a sum of positive squares in only one way, i.e., 42432196 + 30074256 = 6514^2 + 5484^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72506453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9063303 + ... + 9063310.

Almost surely, 2^72506452 is an apocalyptic number.

It is an amenable number.

72506452 is a deficient number, since it is larger than the sum of its proper divisors (54379846).

72506452 is a wasteful number, since it uses less digits than its factorization.

72506452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18126617 (or 18126615 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 72506452 is about 8515.0720490199. The cubic root of 72506452 is about 416.9899147785.

Adding to 72506452 its reverse (25460527), we get a palindrome (97966979).

The spelling of 72506452 in words is "seventy-two million, five hundred six thousand, four hundred fifty-two".