82247640 has 128 divisors (see below), whose sum is σ = 257342400. Its totient is φ = 21012480.

The previous prime is 82247639. The next prime is 82247651. The reversal of 82247640 is 4674228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 359046 + ... + 359274.

Almost surely, 2^82247640 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 82247640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128671200).

82247640 is an abundant number, since it is smaller than the sum of its proper divisors (175094760).

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

82247640 is a wasteful number, since it uses less digits than its factorization.

82247640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 82247640 is about 9069.0484616634. The cubic root of 82247640 is about 434.8850535235.

The spelling of 82247640 in words is "eighty-two million, two hundred forty-seven thousand, six hundred forty".