65640100 has 36 divisors (see below), whose sum is σ = 143348464. Its totient is φ = 26088480.

The previous prime is 65640089. The next prime is 65640143. The reversal of 65640100 is 104656.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14287 + ... + 18313.

Almost surely, 2^65640100 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 65640100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71674232).

65640100 is an abundant number, since it is smaller than the sum of its proper divisors (77708364).

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

65640100 is a wasteful number, since it uses less digits than its factorization.

65640100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4204 (or 4197 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 65640100 is about 8101.8578116380. The cubic root of 65640100 is about 403.3880959877.

Adding to 65640100 its reverse (104656), we get a palindrome (65744756).

The spelling of 65640100 in words is "sixty-five million, six hundred forty thousand, one hundred".