648404736 has 144 divisors (see below), whose sum is σ = 2040729600. Its totient is φ = 178827264.

The previous prime is 648404689. The next prime is 648404741. The reversal of 648404736 is 637404846.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 153825 + ... + 157983.

Almost surely, 2^648404736 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 648404736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020364800).

648404736 is an abundant number, since it is smaller than the sum of its proper divisors (1392324864).

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

648404736 is a wasteful number, since it uses less digits than its factorization.

648404736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214 (or 4200 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 42.

The square root of 648404736 is about 25463.7926476006. The cubic root of 648404736 is about 865.5298683675.

The spelling of 648404736 in words is "six hundred forty-eight million, four hundred four thousand, seven hundred thirty-six".