83427681 has 4 divisors (see below), whose sum is σ = 111236912. Its totient is φ = 55618452.

The previous prime is 83427629. The next prime is 83427703. The reversal of 83427681 is 18672438.

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 de Polignac number, because none of the positive numbers 2^k-83427681 is a prime.

It is a super-2 number, since 2×83427681² = 13920355914075522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83427581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13904611 + ... + 13904616.

It is an arithmetic number, because the mean of its divisors is an integer number (27809228).

Almost surely, 2^83427681 is an apocalyptic number.

It is an amenable number.

83427681 is a deficient number, since it is larger than the sum of its proper divisors (27809231).

83427681 is a wasteful number, since it uses less digits than its factorization.

83427681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27809230.

The product of its digits is 64512, while the sum is 39.

The square root of 83427681 is about 9133.8754644455. The cubic root of 83427681 is about 436.9550107549.

The spelling of 83427681 in words is "eighty-three million, four hundred twenty-seven thousand, six hundred eighty-one".