65000000 has 112 divisors (see below), whose sum is σ = 173632368. Its totient is φ = 24000000.

The previous prime is 64999981. The next prime is 65000011. The reversal of 65000000 is 56.

It can be written as a sum of positive squares in 8 ways, for example, as 38539264 + 26460736 = 6208^2 + 5144^2 .

It is a sliding number, since 65000000 = 25000000 + 40000000 and 1/25000000 + 1/40000000 = 0.000000065000000.

It is a hoax number, since the sum of its digits (11) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 10.

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, 4999994 + ... + 5000006.

It is an arithmetic number, because the mean of its divisors is an integer number (1550289).

Almost surely, 2^65000000 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 65000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86816184).

65000000 is an abundant number, since it is smaller than the sum of its proper divisors (108632368).

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

65000000 is an frugal number, since it uses more digits than its factorization.

65000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60 (or 20 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 65000000 is about 8062.2577482985. The cubic root of 65000000 is about 402.0725758589.

Adding to 65000000 its reverse (56), we get a palindrome (65000056).

The spelling of 65000000 in words is "sixty-five million", and thus it is an aban number and an uban number.