65986240 has 56 divisors (see below), whose sum is σ = 165414960. Its totient is φ = 25003008.

The previous prime is 65986189. The next prime is 65986243. The reversal of 65986240 is 4268956.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 65986193 and 65986202.

It is not an unprimeable number, because it can be changed into a prime (65986243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654 + ... + 11506.

Almost surely, 2^65986240 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 65986240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82707480).

65986240 is an abundant number, since it is smaller than the sum of its proper divisors (99428720).

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

65986240 is a wasteful number, since it uses less digits than its factorization.

65986240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10889 (or 10879 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 65986240 is about 8123.1914910336. The cubic root of 65986240 is about 404.0959155331.

The spelling of 65986240 in words is "sixty-five million, nine hundred eighty-six thousand, two hundred forty".