82781884 has 12 divisors (see below), whose sum is σ = 145706904. Its totient is φ = 41151344.

The previous prime is 82781869. The next prime is 82781887. The reversal of 82781884 is 48818728.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82781887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59122 + ... + 60505.

It is an arithmetic number, because the mean of its divisors is an integer number (12142242).

Almost surely, 2^82781884 is an apocalyptic number.

It is an amenable number.

82781884 is a deficient number, since it is larger than the sum of its proper divisors (62925020).

82781884 is a wasteful number, since it uses less digits than its factorization.

82781884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119804 (or 119802 counting only the distinct ones).

The product of its digits is 229376, while the sum is 46.

The square root of 82781884 is about 9098.4550336857. The cubic root of 82781884 is about 435.8246285696.

The spelling of 82781884 in words is "eighty-two million, seven hundred eighty-one thousand, eight hundred eighty-four".