72451013 has 4 divisors (see below), whose sum is σ = 72481548. Its totient is φ = 72420480.

The previous prime is 72451007. The next prime is 72451021. The reversal of 72451013 is 31015427.

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 39526369 + 32924644 = 6287^2 + 5738^2 .

It is a cyclic number.

It is not a de Polignac number, because 72451013 - 2⁸ = 72450757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72451013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72451063) 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 in 3 ways as a sum of consecutive naturals, for example, 11378 + ... + 16563.

It is an arithmetic number, because the mean of its divisors is an integer number (18120387).

Almost surely, 2^72451013 is an apocalyptic number.

It is an amenable number.

72451013 is a deficient number, since it is larger than the sum of its proper divisors (30535).

72451013 is a wasteful number, since it uses less digits than its factorization.

72451013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30534.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 72451013 is about 8511.8160811897. The cubic root of 72451013 is about 416.8836097638.

The spelling of 72451013 in words is "seventy-two million, four hundred fifty-one thousand, thirteen".