648440425 has 12 divisors (see below), whose sum is σ = 819238860. Its totient is φ = 508963520.

The previous prime is 648440413. The next prime is 648440467. The reversal of 648440425 is 524044846.

It is a happy number.

648440425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 16621929 + 631818496 = 4077^2 + 25136^2 .

It is not a de Polignac number, because 648440425 - 2⁵ = 648440393 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243370 + ... + 246019.

It is an arithmetic number, because the mean of its divisors is an integer number (68269905).

Almost surely, 2^648440425 is an apocalyptic number.

It is an amenable number.

648440425 is a deficient number, since it is larger than the sum of its proper divisors (170798435).

648440425 is a wasteful number, since it uses less digits than its factorization.

648440425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489452 (or 489447 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 37.

The square root of 648440425 is about 25464.4934173056. The cubic root of 648440425 is about 865.5457480216.

The spelling of 648440425 in words is "six hundred forty-eight million, four hundred forty thousand, four hundred twenty-five".