82823781 has 8 divisors (see below), whose sum is σ = 110546464. Its totient is φ = 55158480.

The previous prime is 82823773. The next prime is 82823801. The reversal of 82823781 is 18732828.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82823781 - 2³ = 82823773 is a prime.

It is a super-2 number, since 2×82823781² = 13719557398271922, 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 (82823281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10855 + ... + 16836.

It is an arithmetic number, because the mean of its divisors is an integer number (13818308).

Almost surely, 2^82823781 is an apocalyptic number.

It is an amenable number.

82823781 is a deficient number, since it is larger than the sum of its proper divisors (27722683).

82823781 is a wasteful number, since it uses less digits than its factorization.

82823781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28691.

The product of its digits is 43008, while the sum is 39.

The square root of 82823781 is about 9100.7571663022. The cubic root of 82823781 is about 435.8981416940.

The spelling of 82823781 in words is "eighty-two million, eight hundred twenty-three thousand, seven hundred eighty-one".