648436949 has 8 divisors (see below), whose sum is σ = 656049240. Its totient is φ = 640843776.

The previous prime is 648436931. The next prime is 648436969. The reversal of 648436949 is 949634846.

It can be written as a sum of positive squares in 4 ways, for example, as 734449 + 647702500 = 857^2 + 25450^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648436949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648436949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648436969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70247 + ... + 78939.

It is an arithmetic number, because the mean of its divisors is an integer number (82006155).

Almost surely, 2^648436949 is an apocalyptic number.

It is an amenable number.

648436949 is a deficient number, since it is larger than the sum of its proper divisors (7612291).

648436949 is an equidigital number, since it uses as much as digits as its factorization.

648436949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9559.

The product of its digits is 4478976, while the sum is 53.

The square root of 648436949 is about 25464.4251653164. The cubic root of 648436949 is about 865.5442014172.

The spelling of 648436949 in words is "six hundred forty-eight million, four hundred thirty-six thousand, nine hundred forty-nine".