82661844 has 12 divisors (see below), whose sum is σ = 192877664. Its totient is φ = 27553944.

The previous prime is 82661833. The next prime is 82661849. The reversal of 82661844 is 44816628.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82661849) 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, 3444232 + ... + 3444255.

Almost surely, 2^82661844 is an apocalyptic number.

It is an amenable number.

82661844 is an abundant number, since it is smaller than the sum of its proper divisors (110215820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82661844 is a wasteful number, since it uses less digits than its factorization.

82661844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6888494 (or 6888492 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 82661844 is about 9091.8559161483. The cubic root of 82661844 is about 435.6138670927.

The spelling of 82661844 in words is "eighty-two million, six hundred sixty-one thousand, eight hundred forty-four".