82583781 has 16 divisors (see below), whose sum is σ = 126154368. Its totient is φ = 47073600.

The previous prime is 82583771. The next prime is 82583791. The reversal of 82583781 is 18738528.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (82583771) and next prime (82583791).

It is not a de Polignac number, because 82583781 - 2⁵ = 82583749 is a prime.

It is a super-2 number, since 2×82583781² = 13640161768511922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82583701) 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, 4171 + ... + 13511.

It is an arithmetic number, because the mean of its divisors is an integer number (7884648).

Almost surely, 2^82583781 is an apocalyptic number.

It is an amenable number.

82583781 is a deficient number, since it is larger than the sum of its proper divisors (43570587).

82583781 is a wasteful number, since it uses less digits than its factorization.

82583781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9772.

The product of its digits is 107520, while the sum is 42.

The square root of 82583781 is about 9087.5618842460. The cubic root of 82583781 is about 435.4766976573.

The spelling of 82583781 in words is "eighty-two million, five hundred eighty-three thousand, seven hundred eighty-one".