648753919 has 4 divisors (see below), whose sum is σ = 707731560. Its totient is φ = 589776280.

The previous prime is 648753869. The next prime is 648753929. The reversal of 648753919 is 919357846.

It is a happy number.

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 648753919 - 2⁹ = 648753407 is a prime.

It is a super-2 number, since 2×648753919² = 841763294835717122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648753929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29488804 + ... + 29488825.

It is an arithmetic number, because the mean of its divisors is an integer number (176932890).

Almost surely, 2^648753919 is an apocalyptic number.

648753919 is a deficient number, since it is larger than the sum of its proper divisors (58977641).

648753919 is a wasteful number, since it uses less digits than its factorization.

648753919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58977640.

The product of its digits is 1632960, while the sum is 52.

The square root of 648753919 is about 25470.6481857058. The cubic root of 648753919 is about 865.6852106832.

It can be divided in two parts, 6487 and 53919, that added together give a palindrome (60406).

The spelling of 648753919 in words is "six hundred forty-eight million, seven hundred fifty-three thousand, nine hundred nineteen".