65378321 has 4 divisors (see below), whose sum is σ = 65553972. Its totient is φ = 65202672.

The previous prime is 65378281. The next prime is 65378359. The reversal of 65378321 is 12387356.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28302400 + 37075921 = 5320^2 + 6089^2 .

It is a cyclic number.

It is not a de Polignac number, because 65378321 - 2²² = 61184017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65378921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87266 + ... + 88011.

It is an arithmetic number, because the mean of its divisors is an integer number (16388493).

Almost surely, 2^65378321 is an apocalyptic number.

It is an amenable number.

65378321 is a deficient number, since it is larger than the sum of its proper divisors (175651).

65378321 is a wasteful number, since it uses less digits than its factorization.

65378321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175650.

The product of its digits is 30240, while the sum is 35.

The square root of 65378321 is about 8085.6861799108. The cubic root of 65378321 is about 402.8511314226.

The spelling of 65378321 in words is "sixty-five million, three hundred seventy-eight thousand, three hundred twenty-one".