648893437 has 4 divisors (see below), whose sum is σ = 652518720. Its totient is φ = 645268156.

The previous prime is 648893407. The next prime is 648893449. The reversal of 648893437 is 734398846.

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-648893437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648893407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1812373 + ... + 1812730.

It is an arithmetic number, because the mean of its divisors is an integer number (163129680).

Almost surely, 2^648893437 is an apocalyptic number.

It is an amenable number.

648893437 is a deficient number, since it is larger than the sum of its proper divisors (3625283).

648893437 is a wasteful number, since it uses less digits than its factorization.

648893437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625282.

The product of its digits is 3483648, while the sum is 52.

The square root of 648893437 is about 25473.3868380316. The cubic root of 648893437 is about 865.7472629800.

The spelling of 648893437 in words is "six hundred forty-eight million, eight hundred ninety-three thousand, four hundred thirty-seven".