648142776 has 64 divisors (see below), whose sum is σ = 1816980000. Its totient is φ = 214057728.

The previous prime is 648142771. The next prime is 648142787. The reversal of 648142776 is 677241846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648142771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9780 + ... + 37308.

Almost surely, 2^648142776 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 648142776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (908490000).

648142776 is an abundant number, since it is smaller than the sum of its proper divisors (1168837224).

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

648142776 is a wasteful number, since it uses less digits than its factorization.

648142776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27653 (or 27643 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 648142776 is about 25458.6483537520. The cubic root of 648142776 is about 865.4132926483.

The spelling of 648142776 in words is "six hundred forty-eight million, one hundred forty-two thousand, seven hundred seventy-six".