65691648 has 196 divisors, whose sum is σ = 214879428. Its totient is φ = 19906560.

The previous prime is 65691631. The next prime is 65691667. The reversal of 65691648 is 84619656.

Its product of digits (311040) is a multiple of the sum of its prime divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 5971963 + ... + 5971973.

Almost surely, 2^65691648 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 65691648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107439714).

65691648 is an abundant number, since it is smaller than the sum of its proper divisors (149187780).

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

65691648 is an frugal number, since it uses more digits than its factorization.

65691648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55 (or 16 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 65691648 is about 8105.0384329749. The cubic root of 65691648 is about 403.4936636144.

The spelling of 65691648 in words is "sixty-five million, six hundred ninety-one thousand, six hundred forty-eight".