648740880 has 80 divisors (see below), whose sum is σ = 2234559360. Its totient is φ = 172996992.

The previous prime is 648740879. The next prime is 648740881. The reversal of 648740880 is 88047846.

It is an interprime number because it is at equal distance from previous prime (648740879) and next prime (648740881).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (648740881) 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, 148012 + ... + 152331.

It is an arithmetic number, because the mean of its divisors is an integer number (27931992).

Almost surely, 2^648740880 is an apocalyptic number.

648740880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

648740880 is an abundant number, since it is smaller than the sum of its proper divisors (1585818480).

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

648740880 is a wasteful number, since it uses less digits than its factorization.

648740880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300365 (or 300353 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 648740880 is about 25470.3922231284. The cubic root of 648740880 is about 865.6794109777.

The spelling of 648740880 in words is "six hundred forty-eight million, seven hundred forty thousand, eight hundred eighty".