646038539 has 24 divisors (see below), whose sum is σ = 719306640. Its totient is φ = 578092032.

The previous prime is 646038529. The next prime is 646038553. The reversal of 646038539 is 935830646.

It is not a de Polignac number, because 646038539 - 2¹² = 646034443 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 646038539.

It is not an unprimeable number, because it can be changed into a prime (646038509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1043372 + ... + 1043990.

It is an arithmetic number, because the mean of its divisors is an integer number (29971110).

Almost surely, 2^646038539 is an apocalyptic number.

646038539 is a deficient number, since it is larger than the sum of its proper divisors (73268101).

646038539 is a wasteful number, since it uses less digits than its factorization.

646038539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 646038539 is about 25417.2881913079. The cubic root of 646038539 is about 864.4757374253.

The spelling of 646038539 in words is "six hundred forty-six million, thirty-eight thousand, five hundred thirty-nine".