65671240 has 32 divisors (see below), whose sum is σ = 150553080. Its totient is φ = 25772032.

The previous prime is 65671223. The next prime is 65671253. The reversal of 65671240 is 4217656.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 65577604 + 93636 = 8098^2 + 306^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13369 + ... + 17608.

Almost surely, 2^65671240 is an apocalyptic number.

It is an amenable number.

65671240 is an abundant number, since it is smaller than the sum of its proper divisors (84881840).

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

65671240 is a wasteful number, since it uses less digits than its factorization.

65671240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31041 (or 31037 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 65671240 is about 8103.7793652098. The cubic root of 65671240 is about 403.4518756966.

Adding to 65671240 its reverse (4217656), we get a palindrome (69888896).

The spelling of 65671240 in words is "sixty-five million, six hundred seventy-one thousand, two hundred forty".