648770849 has 4 divisors (see below), whose sum is σ = 658454064. Its totient is φ = 639087636.

The previous prime is 648770809. The next prime is 648770869. The reversal of 648770849 is 948077846.

648770849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-648770849 is a prime.

It is a super-2 number, since 2×648770849² = 841807229024361602, which contains 22 as substring.

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 648770849.

It is not an unprimeable number, because it can be changed into a prime (648770809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4841507 + ... + 4841640.

It is an arithmetic number, because the mean of its divisors is an integer number (164613516).

Almost surely, 2^648770849 is an apocalyptic number.

It is an amenable number.

648770849 is a deficient number, since it is larger than the sum of its proper divisors (9683215).

648770849 is an equidigital number, since it uses as much as digits as its factorization.

648770849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9683214.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The square root of 648770849 is about 25470.9805268663. The cubic root of 648770849 is about 865.6927409771.

The spelling of 648770849 in words is "six hundred forty-eight million, seven hundred seventy thousand, eight hundred forty-nine".