65992640 has 112 divisors (see below), whose sum is σ = 190268352. Its totient is φ = 21282816.

The previous prime is 65992637. The next prime is 65992687. The reversal of 65992640 is 4629956.

It is a tau number, because it is divible by the number of its divisors (112).

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, 37214 + ... + 38946.

Almost surely, 2^65992640 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 65992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95134176).

65992640 is an abundant number, since it is smaller than the sum of its proper divisors (124275712).

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

65992640 is a wasteful number, since it uses less digits than its factorization.

65992640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 65992640 is about 8123.5854153200. The cubic root of 65992640 is about 404.1089795207.

The spelling of 65992640 in words is "sixty-five million, nine hundred ninety-two thousand, six hundred forty".