65471920 has 20 divisors (see below), whose sum is σ = 152222400. Its totient is φ = 26188736.

The previous prime is 65471911. The next prime is 65471951. The reversal of 65471920 is 2917456.

65471920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409120 + ... + 409279.

It is an arithmetic number, because the mean of its divisors is an integer number (7611120).

Almost surely, 2^65471920 is an apocalyptic number.

It is an amenable number.

65471920 is an abundant number, since it is smaller than the sum of its proper divisors (86750480).

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

65471920 is a wasteful number, since it uses less digits than its factorization.

65471920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818412 (or 818406 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 65471920 is about 8091.4720539590. The cubic root of 65471920 is about 403.0432872860.

The spelling of 65471920 in words is "sixty-five million, four hundred seventy-one thousand, nine hundred twenty".