83581823 has 6 divisors (see below), whose sum is σ = 90505944. Its totient is φ = 77152296.

The previous prime is 83581811. The next prime is 83581829. The reversal of 83581823 is 32818538.

It is not a de Polignac number, because 83581823 - 2⁴ = 83581807 is a prime.

It is a super-2 number, since 2×83581823² = 13971842272006658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83581829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 247115 + ... + 247452.

It is an arithmetic number, because the mean of its divisors is an integer number (15084324).

Almost surely, 2^83581823 is an apocalyptic number.

83581823 is a deficient number, since it is larger than the sum of its proper divisors (6924121).

83581823 is a wasteful number, since it uses less digits than its factorization.

83581823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494593 (or 494580 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 83581823 is about 9142.3095003396. The cubic root of 83581823 is about 437.2239529900.

It can be divided in two parts, 835 and 81823, that multiplied together give a triangular number (68322205 = T₁₁₆₈₉).

The spelling of 83581823 in words is "eighty-three million, five hundred eighty-one thousand, eight hundred twenty-three".