65042240 has 56 divisors (see below), whose sum is σ = 155569920. Its totient is φ = 25901568.

The previous prime is 65042239. The next prime is 65042261. The reversal of 65042240 is 4224056.

It is a congruent number.

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, 140249 + ... + 140711.

Almost surely, 2^65042240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65042240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77784960).

65042240 is an abundant number, since it is smaller than the sum of its proper divisors (90527680).

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

65042240 is a wasteful number, since it uses less digits than its factorization.

65042240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 65042240 is about 8064.8769364448. The cubic root of 65042240 is about 402.1596521052.

Adding to 65042240 its reverse (4224056), we get a palindrome (69266296).

The spelling of 65042240 in words is "sixty-five million, forty-two thousand, two hundred forty".