649210920 has 64 divisors (see below), whose sum is σ = 1956294720. Its totient is φ = 172353024.

The previous prime is 649210901. The next prime is 649210921. The reversal of 649210920 is 29012946.

It is not an unprimeable number, because it can be changed into a prime (649210921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15324 + ... + 39156.

It is an arithmetic number, because the mean of its divisors is an integer number (30567105).

Almost surely, 2^649210920 is an apocalyptic number.

649210920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649210920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978147360).

649210920 is an abundant number, since it is smaller than the sum of its proper divisors (1307083800).

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

649210920 is a wasteful number, since it uses less digits than its factorization.

649210920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24074 (or 24070 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 649210920 is about 25479.6177365360. The cubic root of 649210920 is about 865.8884341945. Note that the first 3 decimals are identical.

The spelling of 649210920 in words is "six hundred forty-nine million, two hundred ten thousand, nine hundred twenty".