648781328 has 40 divisors (see below), whose sum is σ = 1356163200. Its totient is φ = 298894464.

The previous prime is 648781327. The next prime is 648781349. The reversal of 648781328 is 823187846.

It is a super-2 number, since 2×648781328² = 841834423122887168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648781327) 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, 126233 + ... + 131271.

It is an arithmetic number, because the mean of its divisors is an integer number (33904080).

Almost surely, 2^648781328 is an apocalyptic number.

It is an amenable number.

648781328 is an abundant number, since it is smaller than the sum of its proper divisors (707381872).

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

648781328 is a wasteful number, since it uses less digits than its factorization.

648781328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5679 (or 5673 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The square root of 648781328 is about 25471.1862307196. The cubic root of 648781328 is about 865.6974018654.

The spelling of 648781328 in words is "six hundred forty-eight million, seven hundred eighty-one thousand, three hundred twenty-eight".