65673881 has 16 divisors (see below), whose sum is σ = 82161408. Its totient is φ = 51105600.

The previous prime is 65673863. The next prime is 65673887. The reversal of 65673881 is 18837656.

It is not a de Polignac number, because 65673881 - 2²² = 61479577 is a prime.

It is a super-2 number, since 2×65673881² = 8626117291204322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65673887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 365 + ... + 11466.

It is an arithmetic number, because the mean of its divisors is an integer number (5135088).

Almost surely, 2^65673881 is an apocalyptic number.

65673881 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

65673881 is a deficient number, since it is larger than the sum of its proper divisors (16487527).

65673881 is a wasteful number, since it uses less digits than its factorization.

65673881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11912.

The product of its digits is 241920, while the sum is 44.

The square root of 65673881 is about 8103.9423122330. The cubic root of 65673881 is about 403.4572839602.

The spelling of 65673881 in words is "sixty-five million, six hundred seventy-three thousand, eight hundred eighty-one".