649343280 has 160 divisors (see below), whose sum is σ = 2082723840. Its totient is φ = 167265280.

The previous prime is 649343269. The next prime is 649343287. The reversal of 649343280 is 82343946.

It is not an unprimeable number, because it can be changed into a prime (649343287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 902761 + ... + 903479.

It is an arithmetic number, because the mean of its divisors is an integer number (13017024).

Almost surely, 2^649343280 is an apocalyptic number.

649343280 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 649343280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1041361920).

649343280 is an abundant number, since it is smaller than the sum of its proper divisors (1433380560).

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

649343280 is a wasteful number, since it uses less digits than its factorization.

649343280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 649343280 is about 25482.2149743699. The cubic root of 649343280 is about 865.9472754748.

The spelling of 649343280 in words is "six hundred forty-nine million, three hundred forty-three thousand, two hundred eighty".