6487729 has 4 divisors (see below), whose sum is σ = 6576676. Its totient is φ = 6398784.

The previous prime is 6487687. The next prime is 6487751. The reversal of 6487729 is 9277846.

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 4297329 + 2190400 = 2073^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 6487729 - 2¹¹ = 6485681 is a prime.

It is a d-powerful number, because it can be written as 6⁸ + 4⁷ + 8³ + 7 + 7² + 2¹³ + 9⁷ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6481729) 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, 44364 + ... + 44509.

It is an arithmetic number, because the mean of its divisors is an integer number (1644169).

Almost surely, 2^6487729 is an apocalyptic number.

It is an amenable number.

6487729 is a deficient number, since it is larger than the sum of its proper divisors (88947).

6487729 is an equidigital number, since it uses as much as digits as its factorization.

6487729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88946.

The product of its digits is 169344, while the sum is 43.

The square root of 6487729 is about 2547.1020788339. The cubic root of 6487729 is about 186.5080437464.

The spelling of 6487729 in words is "six million, four hundred eighty-seven thousand, seven hundred twenty-nine".