64648040 has 16 divisors (see below), whose sum is σ = 145458180. Its totient is φ = 25859200.

The previous prime is 64648033. The next prime is 64648057. The reversal of 64648040 is 4084646.

It can be written as a sum of positive squares in 2 ways, for example, as 59567524 + 5080516 = 7718^2 + 2254^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64647988 and 64648006.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808061 + ... + 808140.

Almost surely, 2^64648040 is an apocalyptic number.

It is an amenable number.

64648040 is an abundant number, since it is smaller than the sum of its proper divisors (80810140).

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

64648040 is a wasteful number, since it uses less digits than its factorization.

64648040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616212 (or 1616208 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 64648040 is about 8040.4004875379. The cubic root of 64648040 is about 401.3455519827.

The spelling of 64648040 in words is "sixty-four million, six hundred forty-eight thousand, forty".