65578240 has 144 divisors (see below), whose sum is σ = 193673088. Its totient is φ = 20717568.

The previous prime is 65578223. The next prime is 65578277. The reversal of 65578240 is 4287556.

It is a happy number.

It is a super-2 number, since 2×65578240² = 8601011122995200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65578240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116199 + ... + 116761.

It is an arithmetic number, because the mean of its divisors is an integer number (1344952).

Almost surely, 2^65578240 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 65578240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96836544).

65578240 is an abundant number, since it is smaller than the sum of its proper divisors (128094848).

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

65578240 is a wasteful number, since it uses less digits than its factorization.

65578240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 65578240 is about 8098.0392688601. The cubic root of 65578240 is about 403.2613369355.

The spelling of 65578240 in words is "sixty-five million, five hundred seventy-eight thousand, two hundred forty".