65133440 has 32 divisors (see below), whose sum is σ = 155711160. Its totient is φ = 26053120.

The previous prime is 65133407. The next prime is 65133469. The reversal of 65133440 is 4433156.

65133440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50246 + ... + 51525.

Almost surely, 2^65133440 is an apocalyptic number.

It is an amenable number.

65133440 is an abundant number, since it is smaller than the sum of its proper divisors (90577720).

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

65133440 is a wasteful number, since it uses less digits than its factorization.

65133440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101790 (or 101778 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 65133440 is about 8070.5291028532. The cubic root of 65133440 is about 402.3475291485.

Adding to 65133440 its reverse (4433156), we get a palindrome (69566596).

The spelling of 65133440 in words is "sixty-five million, one hundred thirty-three thousand, four hundred forty".