648671815 has 16 divisors (see below), whose sum is σ = 849668256. Its totient is φ = 471484800.

The previous prime is 648671801. The next prime is 648671831. The reversal of 648671815 is 518176846.

It is not a de Polignac number, because 648671815 - 2¹⁷ = 648540743 is a prime.

It is a Duffinian number.

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, 166429 + ... + 170281.

It is an arithmetic number, because the mean of its divisors is an integer number (53104266).

Almost surely, 2^648671815 is an apocalyptic number.

648671815 is a deficient number, since it is larger than the sum of its proper divisors (200996441).

648671815 is a wasteful number, since it uses less digits than its factorization.

648671815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930.

The product of its digits is 322560, while the sum is 46.

The square root of 648671815 is about 25469.0363971627. The cubic root of 648671815 is about 865.6486897903.

The spelling of 648671815 in words is "six hundred forty-eight million, six hundred seventy-one thousand, eight hundred fifteen".