72644640454547 has 32 divisors (see below), whose sum is σ = 85971935808000. Its totient is φ = 60093775542528.

The previous prime is 72644640454513. The next prime is 72644640454567. The reversal of 72644640454547 is 74545404644627.

It is a happy number.

It is not a de Polignac number, because 72644640454547 - 2³⁰ = 72643566712723 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 72644640454547.

It is not an unprimeable number, because it can be changed into a prime (72644640454567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4165079 + ... + 12752927.

It is an arithmetic number, because the mean of its divisors is an integer number (2686622994000).

Almost surely, 2^{72644640454547} is an apocalyptic number.

72644640454547 is a deficient number, since it is larger than the sum of its proper divisors (13327295353453).

72644640454547 is a wasteful number, since it uses less digits than its factorization.

72644640454547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8588235.

The product of its (nonzero) digits is 361267200, while the sum is 62.

The spelling of 72644640454547 in words is "seventy-two trillion, six hundred forty-four billion, six hundred forty million, four hundred fifty-four thousand, five hundred forty-seven".