65721875 has 12 divisors (see below), whose sum is σ = 82150992. Its totient is φ = 52575000.

The previous prime is 65721869. The next prime is 65721883. The reversal of 65721875 is 57812756.

It is not a de Polignac number, because 65721875 - 2⁸ = 65721619 is a prime.

It is a Duffinian number.

It is a zygodrome in base 5.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7391 + ... + 13640.

It is an arithmetic number, because the mean of its divisors is an integer number (6845916).

Almost surely, 2^65721875 is an apocalyptic number.

65721875 is a deficient number, since it is larger than the sum of its proper divisors (16429117).

65721875 is an frugal number, since it uses more digits than its factorization.

65721875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21056 (or 21036 counting only the distinct ones).

The product of its digits is 117600, while the sum is 41.

The square root of 65721875 is about 8106.9029228183. The cubic root of 65721875 is about 403.5555412561. Note that the first 4 decimals are identical.

The spelling of 65721875 in words is "sixty-five million, seven hundred twenty-one thousand, eight hundred seventy-five".