65534840 has 64 divisors (see below), whose sum is σ = 171417600. Its totient is φ = 22082688.

The previous prime is 65534831. The next prime is 65534863. The reversal of 65534840 is 4843556.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 65534840.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14537 + ... + 18503.

It is an arithmetic number, because the mean of its divisors is an integer number (2678400).

Almost surely, 2^65534840 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 65534840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85708800).

65534840 is an abundant number, since it is smaller than the sum of its proper divisors (105882760).

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

65534840 is a wasteful number, since it uses less digits than its factorization.

65534840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4044 (or 4040 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 65534840 is about 8095.3591643608. The cubic root of 65534840 is about 403.1723571951.

The spelling of 65534840 in words is "sixty-five million, five hundred thirty-four thousand, eight hundred forty".