65043864 has 128 divisors (see below), whose sum is σ = 190080000. Its totient is φ = 20587392.

The previous prime is 65043857. The next prime is 65043877. The reversal of 65043864 is 46834056.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 436462 + ... + 436610.

It is an arithmetic number, because the mean of its divisors is an integer number (1485000).

Almost surely, 2^65043864 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 65043864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95040000).

65043864 is an abundant number, since it is smaller than the sum of its proper divisors (125036136).

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

65043864 is a wasteful number, since it uses less digits than its factorization.

65043864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 65043864 is about 8064.9776193118. The cubic root of 65043864 is about 402.1629991704.

The spelling of 65043864 in words is "sixty-five million, forty-three thousand, eight hundred sixty-four".