648672429 has 4 divisors (see below), whose sum is σ = 864896576. Its totient is φ = 432448284.

The previous prime is 648672403. The next prime is 648672443. The reversal of 648672429 is 924276846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 648672429 - 2⁷ = 648672301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648672469) 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 3 ways as a sum of consecutive naturals, for example, 108112069 + ... + 108112074.

It is an arithmetic number, because the mean of its divisors is an integer number (216224144).

Almost surely, 2^648672429 is an apocalyptic number.

It is an amenable number.

648672429 is a deficient number, since it is larger than the sum of its proper divisors (216224147).

648672429 is a wasteful number, since it uses less digits than its factorization.

648672429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216224146.

The product of its digits is 1161216, while the sum is 48.

The square root of 648672429 is about 25469.0484510121. The cubic root of 648672429 is about 865.6489629167.

The spelling of 648672429 in words is "six hundred forty-eight million, six hundred seventy-two thousand, four hundred twenty-nine".