649618765 has 8 divisors (see below), whose sum is σ = 780915960. Its totient is φ = 518779392.

The previous prime is 649618747. The next prime is 649618777. The reversal of 649618765 is 567816946.

649618765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11854249 + 637764516 = 3443^2 + 25254^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 649618765 - 2¹³ = 649610573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111324 + ... + 117013.

It is an arithmetic number, because the mean of its divisors is an integer number (97614495).

Almost surely, 2^649618765 is an apocalyptic number.

It is an amenable number.

649618765 is a deficient number, since it is larger than the sum of its proper divisors (131297195).

649618765 is a wasteful number, since it uses less digits than its factorization.

649618765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228911.

The product of its digits is 2177280, while the sum is 52.

The square root of 649618765 is about 25487.6198378742. The cubic root of 649618765 is about 866.0697180332.

The spelling of 649618765 in words is "six hundred forty-nine million, six hundred eighteen thousand, seven hundred sixty-five".