648338949 has 6 divisors (see below), whose sum is σ = 936489606. Its totient is φ = 432225960.

The previous prime is 648338941. The next prime is 648338963. The reversal of 648338949 is 949833846.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 647957025 + 381924 = 25455^2 + 618^2 .

It is not a de Polignac number, because 648338949 - 2³ = 648338941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 648338895 and 648338904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648338941) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36018822 + ... + 36018839.

It is an arithmetic number, because the mean of its divisors is an integer number (156081601).

Almost surely, 2^648338949 is an apocalyptic number.

It is an amenable number.

648338949 is a deficient number, since it is larger than the sum of its proper divisors (288150657).

648338949 is a wasteful number, since it uses less digits than its factorization.

648338949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72037667 (or 72037664 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 648338949 is about 25462.5008394698. The cubic root of 648338949 is about 865.5005952216.

The spelling of 648338949 in words is "six hundred forty-eight million, three hundred thirty-eight thousand, nine hundred forty-nine".