65721776 has 20 divisors (see below), whose sum is σ = 127577400. Its totient is φ = 32798592.

The previous prime is 65721769. The next prime is 65721781. The reversal of 65721776 is 67712756.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5495 + ... + 12713.

It is an arithmetic number, because the mean of its divisors is an integer number (6378870).

Almost surely, 2^65721776 is an apocalyptic number.

It is an amenable number.

65721776 is a deficient number, since it is larger than the sum of its proper divisors (61855624).

65721776 is a wasteful number, since it uses less digits than its factorization.

65721776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7796 (or 7790 counting only the distinct ones).

The product of its digits is 123480, while the sum is 41.

The square root of 65721776 is about 8106.8968169084. The cubic root of 65721776 is about 403.5553386244. Note that the first 3 decimals are identical.

The spelling of 65721776 in words is "sixty-five million, seven hundred twenty-one thousand, seven hundred seventy-six".