65227809 has 4 divisors (see below), whose sum is σ = 86970416. Its totient is φ = 43485204.

The previous prime is 65227807. The next prime is 65227819. The reversal of 65227809 is 90872256.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65227809 - 2¹ = 65227807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65227801) 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, 10871299 + ... + 10871304.

It is an arithmetic number, because the mean of its divisors is an integer number (21742604).

Almost surely, 2^65227809 is an apocalyptic number.

It is an amenable number.

65227809 is a deficient number, since it is larger than the sum of its proper divisors (21742607).

65227809 is a wasteful number, since it uses less digits than its factorization.

65227809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21742606.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 65227809 is about 8076.3735054788. The cubic root of 65227809 is about 402.5417499740.

The spelling of 65227809 in words is "sixty-five million, two hundred twenty-seven thousand, eight hundred nine".