648690328 has 64 divisors (see below), whose sum is σ = 1478282400. Its totient is φ = 262778880.

The previous prime is 648690319. The next prime is 648690349. The reversal of 648690328 is 823096846.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23400 + ... + 42952.

Almost surely, 2^648690328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648690328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (739141200).

648690328 is an abundant number, since it is smaller than the sum of its proper divisors (829592072).

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

648690328 is a wasteful number, since it uses less digits than its factorization.

648690328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19612 (or 19608 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 648690328 is about 25469.3998358815. The cubic root of 648690328 is about 865.6569248749.

The spelling of 648690328 in words is "six hundred forty-eight million, six hundred ninety thousand, three hundred twenty-eight".