649360218 has 16 divisors (see below), whose sum is σ = 1398622176. Its totient is φ = 199803120.

The previous prime is 649360213. The next prime is 649360223. The reversal of 649360218 is 812063946.

It is an interprime number because it is at equal distance from previous prime (649360213) and next prime (649360223).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (649360213) 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, 4162488 + ... + 4162643.

It is an arithmetic number, because the mean of its divisors is an integer number (87413886).

Almost surely, 2^649360218 is an apocalyptic number.

649360218 is an abundant number, since it is smaller than the sum of its proper divisors (749261958).

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

649360218 is a wasteful number, since it uses less digits than its factorization.

649360218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325149.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 649360218 is about 25482.5473216474. The cubic root of 649360218 is about 865.9548047678.

The spelling of 649360218 in words is "six hundred forty-nine million, three hundred sixty thousand, two hundred eighteen".