648045728 has 24 divisors (see below), whose sum is σ = 1391826240. Its totient is φ = 294566080.

The previous prime is 648045709. The next prime is 648045743. The reversal of 648045728 is 827540846.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920168 + ... + 920871.

It is an arithmetic number, because the mean of its divisors is an integer number (57992760).

Almost surely, 2^648045728 is an apocalyptic number.

It is an amenable number.

648045728 is an abundant number, since it is smaller than the sum of its proper divisors (743780512).

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

648045728 is a wasteful number, since it uses less digits than its factorization.

648045728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841060 (or 1841052 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 44.

The square root of 648045728 is about 25456.7422896175. The cubic root of 648045728 is about 865.3700970107.

The spelling of 648045728 in words is "six hundred forty-eight million, forty-five thousand, seven hundred twenty-eight".