64317040 has 20 divisors (see below), whose sum is σ = 149537304. Its totient is φ = 25726784.

The previous prime is 64317023. The next prime is 64317047. The reversal of 64317040 is 4071346.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 64316996 and 64317014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64317047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401902 + ... + 402061.

Almost surely, 2^64317040 is an apocalyptic number.

It is an amenable number.

64317040 is an abundant number, since it is smaller than the sum of its proper divisors (85220264).

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

64317040 is a wasteful number, since it uses less digits than its factorization.

64317040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803976 (or 803970 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 64317040 is about 8019.7905209550. The cubic root of 64317040 is about 400.6594123411.

Adding to 64317040 its reverse (4071346), we get a palindrome (68388386).

The spelling of 64317040 in words is "sixty-four million, three hundred seventeen thousand, forty".