65040644 has 6 divisors (see below), whose sum is σ = 113821134. Its totient is φ = 32520320.

The previous prime is 65040641. The next prime is 65040671. The reversal of 65040644 is 44604056.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 238144 = 8050^2 + 488^2 .

It is not an unprimeable number, because it can be changed into a prime (65040641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8130077 + ... + 8130084.

It is an arithmetic number, because the mean of its divisors is an integer number (18970189).

Almost surely, 2^65040644 is an apocalyptic number.

It is an amenable number.

65040644 is a deficient number, since it is larger than the sum of its proper divisors (48780490).

65040644 is a wasteful number, since it uses less digits than its factorization.

65040644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16260165 (or 16260163 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 65040644 is about 8064.7779882648. Note that the first 3 decimals coincide. The cubic root of 65040644 is about 402.1563626939.

The spelling of 65040644 in words is "sixty-five million, forty thousand, six hundred forty-four".