82779831 has 12 divisors (see below), whose sum is σ = 122115552. Its totient is φ = 54012096.

The previous prime is 82779811. The next prime is 82779839. The reversal of 82779831 is 13897728.

It is not a de Polignac number, because 82779831 - 2¹³ = 82771639 is a prime.

It is a super-2 number, since 2×82779831² = 13705000840777122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82779839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97426 + ... + 98271.

It is an arithmetic number, because the mean of its divisors is an integer number (10176296).

Almost surely, 2^82779831 is an apocalyptic number.

82779831 is a deficient number, since it is larger than the sum of its proper divisors (39335721).

82779831 is a wasteful number, since it uses less digits than its factorization.

82779831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195750 (or 195747 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 82779831 is about 9098.3422116339. The cubic root of 82779831 is about 435.8210257066.

The spelling of 82779831 in words is "eighty-two million, seven hundred seventy-nine thousand, eight hundred thirty-one".