65440238 has 8 divisors (see below), whose sum is σ = 100443288. Its totient is φ = 31959144.

The previous prime is 65440201. The next prime is 65440247. The reversal of 65440238 is 83204456.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380381 + ... + 380552.

It is an arithmetic number, because the mean of its divisors is an integer number (12555411).

Almost surely, 2^65440238 is an apocalyptic number.

65440238 is a deficient number, since it is larger than the sum of its proper divisors (35003050).

65440238 is a wasteful number, since it uses less digits than its factorization.

65440238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760978.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 65440238 is about 8089.5140768775. The cubic root of 65440238 is about 402.9782656316.

The spelling of 65440238 in words is "sixty-five million, four hundred forty thousand, two hundred thirty-eight".