648378055 has 16 divisors (see below), whose sum is σ = 840952224. Its totient is φ = 477060480.

The previous prime is 648378041. The next prime is 648378061. The reversal of 648378055 is 550873846.

648378055 is a nontrivial binomial coefficient, being equal to C(36011, 2).

It is not a de Polignac number, because 648378055 - 2¹³ = 648369863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648377996 and 648378014.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1 + ... + 36010.

It is an arithmetic number, because the mean of its divisors is an integer number (52559514).

Almost surely, 2^648378055 is an apocalyptic number.

648378055 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

648378055 is the 36010-th triangular number.

648378055 is the 12004-th centered nonagonal number.

648378055 is a deficient number, since it is larger than the sum of its proper divisors (192574169).

648378055 is a wasteful number, since it uses less digits than its factorization.

648378055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36306.

The product of its (nonzero) digits is 806400, while the sum is 46.

The square root of 648378055 is about 25463.2687414637. The cubic root of 648378055 is about 865.5179964003.

The spelling of 648378055 in words is "six hundred forty-eight million, three hundred seventy-eight thousand, fifty-five".