82573440 has 128 divisors (see below), whose sum is σ = 272462400. Its totient is φ = 21245952.

The previous prime is 82573397. The next prime is 82573441. The reversal of 82573440 is 4437528.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82573441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54939 + ... + 56421.

Almost surely, 2^82573440 is an apocalyptic number.

82573440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82573440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136231200).

82573440 is an abundant number, since it is smaller than the sum of its proper divisors (189888960).

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

82573440 is a wasteful number, since it uses less digits than its factorization.

82573440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1534 (or 1522 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 82573440 is about 9086.9929019451. The cubic root of 82573440 is about 435.4585203492.

The spelling of 82573440 in words is "eighty-two million, five hundred seventy-three thousand, four hundred forty".