65999712 has 96 divisors (see below), whose sum is σ = 188570592. Its totient is φ = 20127744.

The previous prime is 65999693. The next prime is 65999723. The reversal of 65999712 is 21799956.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 59838 + ... + 60930.

It is an arithmetic number, because the mean of its divisors is an integer number (1964277).

Almost surely, 2^65999712 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 65999712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94285296).

65999712 is an abundant number, since it is smaller than the sum of its proper divisors (122570880).

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

65999712 is a wasteful number, since it uses less digits than its factorization.

65999712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160 (or 1152 counting only the distinct ones).

The product of its digits is 306180, while the sum is 48.

The square root of 65999712 is about 8124.0206794419. The cubic root of 65999712 is about 404.1234142446.

The spelling of 65999712 in words is "sixty-five million, nine hundred ninety-nine thousand, seven hundred twelve".