648987879 has 8 divisors (see below), whose sum is σ = 865561840. Its totient is φ = 432536256.

The previous prime is 648987877. The next prime is 648987887. The reversal of 648987879 is 978789846.

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

It is not a de Polignac number, because 648987879 - 2¹ = 648987877 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 (648987877) 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, 17392 + ... + 40005.

It is an arithmetic number, because the mean of its divisors is an integer number (108195230).

Almost surely, 2^648987879 is an apocalyptic number.

648987879 is a deficient number, since it is larger than the sum of its proper divisors (216573961).

648987879 is a wasteful number, since it uses less digits than its factorization.

648987879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61169.

The product of its digits is 48771072, while the sum is 66.

The square root of 648987879 is about 25475.2405091689. The cubic root of 648987879 is about 865.7892621394.

The spelling of 648987879 in words is "six hundred forty-eight million, nine hundred eighty-seven thousand, eight hundred seventy-nine".