65999328 has 96 divisors (see below), whose sum is σ = 183762432. Its totient is φ = 20697600.

The previous prime is 65999317. The next prime is 65999333. The reversal of 65999328 is 82399956.

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

It is a super-2 number, since 2×65999328² = 8711822592903168, which contains 22 as substring.

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, 156558 + ... + 156978.

It is an arithmetic number, because the mean of its divisors is an integer number (1914192).

Almost surely, 2^65999328 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 65999328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91881216).

65999328 is an abundant number, since it is smaller than the sum of its proper divisors (117763104).

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

65999328 is a wasteful number, since it uses less digits than its factorization.

65999328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 520 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 51.

The square root of 65999328 is about 8123.9970457897. The cubic root of 65999328 is about 404.1226304852.

The spelling of 65999328 in words is "sixty-five million, nine hundred ninety-nine thousand, three hundred twenty-eight".