648394015 has 4 divisors (see below), whose sum is σ = 778072824. Its totient is φ = 518715208.

The previous prime is 648394013. The next prime is 648394051. The reversal of 648394015 is 510493846.

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 648394015 - 2¹ = 648394013 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 (648394013) 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 3 ways as a sum of consecutive naturals, for example, 64839397 + ... + 64839406.

It is an arithmetic number, because the mean of its divisors is an integer number (194518206).

Almost surely, 2^648394015 is an apocalyptic number.

648394015 is a deficient number, since it is larger than the sum of its proper divisors (129678809).

648394015 is a wasteful number, since it uses less digits than its factorization.

648394015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129678808.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 648394015 is about 25463.5821321353. The cubic root of 648394015 is about 865.5250979947.

The spelling of 648394015 in words is "six hundred forty-eight million, three hundred ninety-four thousand, fifteen".