649109766 has 8 divisors (see below), whose sum is σ = 1298219544. Its totient is φ = 216369920.

The previous prime is 649109753. The next prime is 649109779. The reversal of 649109766 is 667901946.

It is an interprime number because it is at equal distance from previous prime (649109753) and next prime (649109779).

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

649109766 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54092475 + ... + 54092486.

It is an arithmetic number, because the mean of its divisors is an integer number (162277443).

Almost surely, 2^649109766 is an apocalyptic number.

649109766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649109766 is a wasteful number, since it uses less digits than its factorization.

649109766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108184966.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 649109766 is about 25477.6326608262. The cubic root of 649109766 is about 865.8434603011.

The spelling of 649109766 in words is "six hundred forty-nine million, one hundred nine thousand, seven hundred sixty-six".