83644881 has 4 divisors (see below), whose sum is σ = 111526512. Its totient is φ = 55763252.

The previous prime is 83644871. The next prime is 83644889. The reversal of 83644881 is 18844638.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83644881 - 2²² = 79450577 is a prime.

It is a super-2 number, since 2×83644881² = 13992932235008322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83644889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13940811 + ... + 13940816.

It is an arithmetic number, because the mean of its divisors is an integer number (27881628).

Almost surely, 2^83644881 is an apocalyptic number.

It is an amenable number.

83644881 is a deficient number, since it is larger than the sum of its proper divisors (27881631).

83644881 is a wasteful number, since it uses less digits than its factorization.

83644881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27881630.

The product of its digits is 147456, while the sum is 42.

The square root of 83644881 is about 9145.7575410679. The cubic root of 83644881 is about 437.3338793530. Note that the first 3 decimals are identical.

The spelling of 83644881 in words is "eighty-three million, six hundred forty-four thousand, eight hundred eighty-one".