646020547 has 4 divisors (see below), whose sum is σ = 647492560. Its totient is φ = 644548536.

The previous prime is 646020533. The next prime is 646020569. The reversal of 646020547 is 745020646.

646020547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646020547 - 2¹⁵ = 645987779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646020517) 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, 735348 + ... + 736225.

It is an arithmetic number, because the mean of its divisors is an integer number (161873140).

Almost surely, 2^646020547 is an apocalyptic number.

646020547 is a deficient number, since it is larger than the sum of its proper divisors (1472013).

646020547 is a wasteful number, since it uses less digits than its factorization.

646020547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472012.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 646020547 is about 25416.9342565149. The cubic root of 646020547 is about 864.4677122117.

Subtracting 646020547 from its reverse (745020646), we obtain a palindrome (99000099).

The spelling of 646020547 in words is "six hundred forty-six million, twenty thousand, five hundred forty-seven".