72447532013 has 4 divisors (see below), whose sum is σ = 73112188380. Its totient is φ = 71782875648.

The previous prime is 72447531983. The next prime is 72447532033. The reversal of 72447532013 is 31023574427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31023574427 = 41 ⋅756672547.

It can be written as a sum of positive squares in 2 ways, for example, as 57146336809 + 15301195204 = 239053^2 + 123698^2 .

It is a cyclic number.

It is not a de Polignac number, because 72447532013 - 2¹⁰ = 72447530989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72447532033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332328020 + ... + 332328237.

It is an arithmetic number, because the mean of its divisors is an integer number (18278047095).

Almost surely, 2^72447532013 is an apocalyptic number.

It is an amenable number.

72447532013 is a deficient number, since it is larger than the sum of its proper divisors (664656367).

72447532013 is a wasteful number, since it uses less digits than its factorization.

72447532013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664656366.

The product of its (nonzero) digits is 141120, while the sum is 38.

The spelling of 72447532013 in words is "seventy-two billion, four hundred forty-seven million, five hundred thirty-two thousand, thirteen".