649449888 has 24 divisors (see below), whose sum is σ = 1704806208. Its totient is φ = 216483264.

The previous prime is 649449883. The next prime is 649449947. The reversal of 649449888 is 888944946.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (649449883) 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, 3382456 + ... + 3382647.

It is an arithmetic number, because the mean of its divisors is an integer number (71033592).

Almost surely, 2^649449888 is an apocalyptic number.

It is an amenable number.

649449888 is an abundant number, since it is smaller than the sum of its proper divisors (1055356320).

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

649449888 is a wasteful number, since it uses less digits than its factorization.

649449888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6765116 (or 6765108 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 60.

The square root of 649449888 is about 25484.3067003990. The cubic root of 649449888 is about 865.9946627651.

The spelling of 649449888 in words is "six hundred forty-nine million, four hundred forty-nine thousand, eight hundred eighty-eight".