648736881 has 32 divisors (see below), whose sum is σ = 998282880. Its totient is φ = 371180544.

The previous prime is 648736877. The next prime is 648736889. The reversal of 648736881 is 188637846.

648736881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 648736881 - 2² = 648736877 is a prime.

It is a super-2 number, since 2×648736881² = 841719081539216322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (648736889) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49135 + ... + 60923.

It is an arithmetic number, because the mean of its divisors is an integer number (31196340).

Almost surely, 2^648736881 is an apocalyptic number.

It is an amenable number.

648736881 is a deficient number, since it is larger than the sum of its proper divisors (349545999).

648736881 is a wasteful number, since it uses less digits than its factorization.

648736881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11905.

The product of its digits is 1548288, while the sum is 51.

The square root of 648736881 is about 25470.3137200938. The cubic root of 648736881 is about 865.6776322197.

The spelling of 648736881 in words is "six hundred forty-eight million, seven hundred thirty-six thousand, eight hundred eighty-one".