65201640 has 64 divisors (see below), whose sum is σ = 223551360. Its totient is φ = 14903040.

The previous prime is 65201621. The next prime is 65201641. The reversal of 65201640 is 4610256.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 65201640.

It is not an unprimeable number, because it can be changed into a prime (65201641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37971 + ... + 39650.

It is an arithmetic number, because the mean of its divisors is an integer number (3492990).

Almost surely, 2^65201640 is an apocalyptic number.

65201640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65201640 is an abundant number, since it is smaller than the sum of its proper divisors (158349720).

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

65201640 is a wasteful number, since it uses less digits than its factorization.

65201640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77642 (or 77638 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 65201640 is about 8074.7532470039. The cubic root of 65201640 is about 402.4879103399.

Adding to 65201640 its reverse (4610256), we get a palindrome (69811896).

The spelling of 65201640 in words is "sixty-five million, two hundred one thousand, six hundred forty".