648887518 has 16 divisors (see below), whose sum is σ = 1036766304. Its totient is φ = 303527680.

The previous prime is 648887513. The next prime is 648887521. The reversal of 648887518 is 815788846.

It is a happy number.

It is a super-2 number, since 2×648887518² = 842110022032400648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648887513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51463 + ... + 62818.

It is an arithmetic number, because the mean of its divisors is an integer number (64797894).

Almost surely, 2^648887518 is an apocalyptic number.

648887518 is a deficient number, since it is larger than the sum of its proper divisors (387878786).

648887518 is a wasteful number, since it uses less digits than its factorization.

648887518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114467.

The product of its digits is 3440640, while the sum is 55.

The square root of 648887518 is about 25473.2706576914. The cubic root of 648887518 is about 865.7446306147.

The spelling of 648887518 in words is "six hundred forty-eight million, eight hundred eighty-seven thousand, five hundred eighteen".