64917040 has 40 divisors (see below), whose sum is σ = 157498848. Its totient is φ = 24837120.

The previous prime is 64917029. The next prime is 64917049. The reversal of 64917040 is 4071946.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64916993 and 64917011.

It is not an unprimeable number, because it can be changed into a prime (64917049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15801 + ... + 19480.

Almost surely, 2^64917040 is an apocalyptic number.

It is an amenable number.

64917040 is an abundant number, since it is smaller than the sum of its proper divisors (92581808).

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

64917040 is a wasteful number, since it uses less digits than its factorization.

64917040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35317 (or 35311 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 64917040 is about 8057.1111448211. Note that the first 4 decimals coincide. The cubic root of 64917040 is about 401.9014469267.

Adding to 64917040 its reverse (4071946), we get a palindrome (68988986).

It can be divided in two parts, 6491 and 7040, that added together give a palindrome (13531).

The spelling of 64917040 in words is "sixty-four million, nine hundred seventeen thousand, forty".