648278829 has 32 divisors (see below), whose sum is σ = 1049385600. Its totient is φ = 392273280.

The previous prime is 648278821. The next prime is 648278837. The reversal of 648278829 is 928872846.

It is an interprime number because it is at equal distance from previous prime (648278821) and next prime (648278837).

It is not a de Polignac number, because 648278829 - 2³ = 648278821 is a prime.

It is a super-2 number, since 2×648278829² = 840530880259222482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648278821) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 244897 + ... + 247529.

It is an arithmetic number, because the mean of its divisors is an integer number (32793300).

Almost surely, 2^648278829 is an apocalyptic number.

It is an amenable number.

648278829 is a deficient number, since it is larger than the sum of its proper divisors (401106771).

648278829 is a wasteful number, since it uses less digits than its factorization.

648278829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3482 (or 3476 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 54.

The square root of 648278829 is about 25461.3202524928. The cubic root of 648278829 is about 865.4738419807.

The spelling of 648278829 in words is "six hundred forty-eight million, two hundred seventy-eight thousand, eight hundred twenty-nine".