65140820 has 24 divisors (see below), whose sum is σ = 138672744. Its totient is φ = 25698816.

The previous prime is 65140813. The next prime is 65140837. The reversal of 65140820 is 2804156.

It can be written as a sum of positive squares in 4 ways, for example, as 948676 + 64192144 = 974^2 + 8012^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 65140820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20849 + ... + 23768.

It is an arithmetic number, because the mean of its divisors is an integer number (5778031).

Almost surely, 2^65140820 is an apocalyptic number.

It is an amenable number.

65140820 is an abundant number, since it is smaller than the sum of its proper divisors (73531924).

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

65140820 is a wasteful number, since it uses less digits than its factorization.

65140820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44699 (or 44697 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 65140820 is about 8070.9863089959. The cubic root of 65140820 is about 402.3627246847.

Adding to 65140820 its reverse (2804156), we get a palindrome (67944976).

The spelling of 65140820 in words is "sixty-five million, one hundred forty thousand, eight hundred twenty".