82771989 has 8 divisors (see below), whose sum is σ = 113054592. Its totient is φ = 53835360.

The previous prime is 82771979. The next prime is 82771991. The reversal of 82771989 is 98917728.

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

It is not a de Polignac number, because 82771989 - 2⁴ = 82771973 is a prime.

It is a super-2 number, since 2×82771989² = 13702404326032242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82771919) 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 7 ways as a sum of consecutive naturals, for example, 336349 + ... + 336594.

It is an arithmetic number, because the mean of its divisors is an integer number (14131824).

Almost surely, 2^82771989 is an apocalyptic number.

It is an amenable number.

82771989 is a deficient number, since it is larger than the sum of its proper divisors (30282603).

82771989 is a wasteful number, since it uses less digits than its factorization.

82771989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672987.

The product of its digits is 508032, while the sum is 51.

The square root of 82771989 is about 9097.9112437966. The cubic root of 82771989 is about 435.8072630288.

The spelling of 82771989 in words is "eighty-two million, seven hundred seventy-one thousand, nine hundred eighty-nine".