648643237 has 4 divisors (see below), whose sum is σ = 707610816. Its totient is φ = 589675660.

The previous prime is 648643231. The next prime is 648643253. The reversal of 648643237 is 732346846.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648643237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648643193 and 648643202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648643231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29483773 + ... + 29483794.

It is an arithmetic number, because the mean of its divisors is an integer number (176902704).

Almost surely, 2^648643237 is an apocalyptic number.

It is an amenable number.

648643237 is a deficient number, since it is larger than the sum of its proper divisors (58967579).

648643237 is a wasteful number, since it uses less digits than its factorization.

648643237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58967578.

The product of its digits is 580608, while the sum is 43.

The square root of 648643237 is about 25468.4753568014. The cubic root of 648643237 is about 865.6359772131.

The spelling of 648643237 in words is "six hundred forty-eight million, six hundred forty-three thousand, two hundred thirty-seven".