65445138 has 64 divisors (see below), whose sum is σ = 168013440. Its totient is φ = 18662400.

The previous prime is 65445113. The next prime is 65445167. The reversal of 65445138 is 83154456.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6858 + ... + 13338.

It is an arithmetic number, because the mean of its divisors is an integer number (2625210).

Almost surely, 2^65445138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65445138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84006720).

65445138 is an abundant number, since it is smaller than the sum of its proper divisors (102568302).

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

65445138 is a wasteful number, since it uses less digits than its factorization.

65445138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6520 (or 6514 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 65445138 is about 8089.8169324157. The cubic root of 65445138 is about 402.9883233794.

The spelling of 65445138 in words is "sixty-five million, four hundred forty-five thousand, one hundred thirty-eight".