648652777 has 4 divisors (see below), whose sum is σ = 652236676. Its totient is φ = 645068880.

The previous prime is 648652757. The next prime is 648652793. The reversal of 648652777 is 777256846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 249292521 + 399360256 = 15789^2 + 19984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648652777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648652747) 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, 1791678 + ... + 1792039.

It is an arithmetic number, because the mean of its divisors is an integer number (163059169).

Almost surely, 2^648652777 is an apocalyptic number.

It is an amenable number.

648652777 is a deficient number, since it is larger than the sum of its proper divisors (3583899).

648652777 is a wasteful number, since it uses less digits than its factorization.

648652777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3583898.

The product of its digits is 3951360, while the sum is 52.

The square root of 648652777 is about 25468.6626464760. The cubic root of 648652777 is about 865.6402210081.

The spelling of 648652777 in words is "six hundred forty-eight million, six hundred fifty-two thousand, seven hundred seventy-seven".