648139855 has 16 divisors (see below), whose sum is σ = 849112704. Its totient is φ = 471019680.

The previous prime is 648139781. The next prime is 648139873. The reversal of 648139855 is 558931846.

648139855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 648139855 - 2⁷ = 648139727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648139799 and 648139808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85864 + ... + 93106.

It is an arithmetic number, because the mean of its divisors is an integer number (53069544).

Almost surely, 2^648139855 is an apocalyptic number.

648139855 is a deficient number, since it is larger than the sum of its proper divisors (200972849).

648139855 is a wasteful number, since it uses less digits than its factorization.

648139855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8886.

The product of its digits is 1036800, while the sum is 49.

The square root of 648139855 is about 25458.5909861485. The cubic root of 648139855 is about 865.4119925870.

The spelling of 648139855 in words is "six hundred forty-eight million, one hundred thirty-nine thousand, eight hundred fifty-five".