646203079 has 4 divisors (see below), whose sum is σ = 647814960. Its totient is φ = 644591200.

The previous prime is 646203037. The next prime is 646203119. The reversal of 646203079 is 970302646.

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 646203079 - 2¹⁹ = 645678791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646203479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805339 + ... + 806140.

It is an arithmetic number, because the mean of its divisors is an integer number (161953740).

Almost surely, 2^646203079 is an apocalyptic number.

646203079 is a deficient number, since it is larger than the sum of its proper divisors (1611881).

646203079 is a wasteful number, since it uses less digits than its factorization.

646203079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611880.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 646203079 is about 25420.5247585489. The cubic root of 646203079 is about 864.5491225023.

The spelling of 646203079 in words is "six hundred forty-six million, two hundred three thousand, seventy-nine".