648781401 has 16 divisors (see below), whose sum is σ = 903519360. Its totient is φ = 413318400.

The previous prime is 648781381. The next prime is 648781433. The reversal of 648781401 is 104187846.

It is not a de Polignac number, because 648781401 - 2²³ = 640392793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648781401.

It is not an unprimeable number, because it can be changed into a prime (648781501) 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, 78955 + ... + 86783.

It is an arithmetic number, because the mean of its divisors is an integer number (56469960).

Almost surely, 2^648781401 is an apocalyptic number.

It is an amenable number.

648781401 is a deficient number, since it is larger than the sum of its proper divisors (254737959).

648781401 is a wasteful number, since it uses less digits than its factorization.

648781401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9056.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 648781401 is about 25471.1876637113. The cubic root of 648781401 is about 865.6974343345.

The spelling of 648781401 in words is "six hundred forty-eight million, seven hundred eighty-one thousand, four hundred one".