65023640 has 64 divisors (see below), whose sum is σ = 169011360. Its totient is φ = 22251520.

The previous prime is 65023639. The next prime is 65023669. The reversal of 65023640 is 4632056.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3134 + ... + 11826.

Almost surely, 2^65023640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65023640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84505680).

65023640 is an abundant number, since it is smaller than the sum of its proper divisors (103987720).

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

65023640 is a wasteful number, since it uses less digits than its factorization.

65023640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8732 (or 8728 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 65023640 is about 8063.7237055842. The cubic root of 65023640 is about 402.1213135185.

Adding to 65023640 its reverse (4632056), we get a palindrome (69655696).

The spelling of 65023640 in words is "sixty-five million, twenty-three thousand, six hundred forty".