64487047249 has 27 divisors (see below), whose sum is σ = 68916723057. Its totient is φ = 60336856800.

The previous prime is 64487047181. The next prime is 64487047267. The reversal of 64487047249 is 94274078446.

The square root of 64487047249 is 253943.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 59337549649 + 5149497600 = 243593^2 + 71760^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64487047249 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 64487047249.

It is not an unprimeable number, because it can be changed into a prime (64487047279) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 356281939 + ... + 356282119.

Almost surely, 2^64487047249 is an apocalyptic number.

64487047249 is the 253943-rd square number.

64487047249 is the 126972-nd centered octagonal number.

It is an amenable number.

64487047249 is a deficient number, since it is larger than the sum of its proper divisors (4429675808).

64487047249 is an frugal number, since it uses more digits than its factorization.

64487047249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 55.

The spelling of 64487047249 in words is "sixty-four billion, four hundred eighty-seven million, forty-seven thousand, two hundred forty-nine".