65904440 has 64 divisors (see below), whose sum is σ = 172704960. Its totient is φ = 22164480.

The previous prime is 65904439. The next prime is 65904451. The reversal of 65904440 is 4440956.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 65904397 and 65904406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12620 + ... + 17060.

It is an arithmetic number, because the mean of its divisors is an integer number (2698515).

Almost surely, 2^65904440 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 65904440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86352480).

65904440 is an abundant number, since it is smaller than the sum of its proper divisors (106800520).

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

65904440 is a wasteful number, since it uses less digits than its factorization.

65904440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4512 (or 4508 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 65904440 is about 8118.1549627979. The cubic root of 65904440 is about 403.9288669978.

The spelling of 65904440 in words is "sixty-five million, nine hundred four thousand, four hundred forty".