82404440 has 64 divisors (see below), whose sum is σ = 197704800. Its totient is φ = 30803968.

The previous prime is 82404437. The next prime is 82404503. The reversal of 82404440 is 4440428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121382 + ... + 122058.

Almost surely, 2^82404440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82404440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98852400).

82404440 is an abundant number, since it is smaller than the sum of its proper divisors (115300360).

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

82404440 is a wasteful number, since it uses less digits than its factorization.

82404440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 82404440 is about 9077.6891332541. The cubic root of 82404440 is about 435.1612385055.

Adding to 82404440 its reverse (4440428), we get a palindrome (86844868).

The spelling of 82404440 in words is "eighty-two million, four hundred four thousand, four hundred forty".