648278029 has 16 divisors (see below), whose sum is σ = 753016320. Its totient is φ = 546624000.

The previous prime is 648278027. The next prime is 648278039. The reversal of 648278029 is 920872846.

It is a cyclic number.

It is not a de Polignac number, because 648278029 - 2¹ = 648278027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648278029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648278021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 160029 + ... + 164029.

It is an arithmetic number, because the mean of its divisors is an integer number (47063520).

Almost surely, 2^648278029 is an apocalyptic number.

It is an amenable number.

648278029 is a deficient number, since it is larger than the sum of its proper divisors (104738291).

648278029 is a wasteful number, since it uses less digits than its factorization.

648278029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4380.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 648278029 is about 25461.3045423835. The cubic root of 648278029 is about 865.4734859717.

The spelling of 648278029 in words is "six hundred forty-eight million, two hundred seventy-eight thousand, twenty-nine".