65917040 has 40 divisors (see below), whose sum is σ = 175152480. Its totient is φ = 22599936.

The previous prime is 65917021. The next prime is 65917043. The reversal of 65917040 is 4071956.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 65916988 and 65917006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65917043) 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, 58295 + ... + 59414.

It is an arithmetic number, because the mean of its divisors is an integer number (4378812).

Almost surely, 2^65917040 is an apocalyptic number.

It is an amenable number.

65917040 is an abundant number, since it is smaller than the sum of its proper divisors (109235440).

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

65917040 is a wasteful number, since it uses less digits than its factorization.

65917040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117729 (or 117723 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 65917040 is about 8118.9309641110. The cubic root of 65917040 is about 403.9546071928.

Adding to 65917040 its reverse (4071956), we get a palindrome (69988996).

It can be divided in two parts, 6591 and 7040, that added together give a palindrome (13631).

The spelling of 65917040 in words is "sixty-five million, nine hundred seventeen thousand, forty".