646288379 has 8 divisors (see below), whose sum is σ = 706682880. Its totient is φ = 586167400.

The previous prime is 646288343. The next prime is 646288393. The reversal of 646288379 is 973882646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646288379 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 646288379.

It is not an unprimeable number, because it can be changed into a prime (646288309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63419 + ... + 72900.

It is an arithmetic number, because the mean of its divisors is an integer number (88335360).

Almost surely, 2^646288379 is an apocalyptic number.

646288379 is a deficient number, since it is larger than the sum of its proper divisors (60394501).

646288379 is a wasteful number, since it uses less digits than its factorization.

646288379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136761.

The product of its digits is 3483648, while the sum is 53.

The square root of 646288379 is about 25422.2024812958. The cubic root of 646288379 is about 864.5871615223.

The spelling of 646288379 in words is "six hundred forty-six million, two hundred eighty-eight thousand, three hundred seventy-nine".