82563390 has 192 divisors, whose sum is σ = 280215936. Its totient is φ = 16367616.

The previous prime is 82563389. The next prime is 82563401. The reversal of 82563390 is 9336528.

82563390 is a `hidden beast` number, since 8 + 2 + 563 + 3 + 90 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 138934 + ... + 139526.

It is an arithmetic number, because the mean of its divisors is an integer number (1459458).

Almost surely, 2^82563390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82563390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140107968).

82563390 is an abundant number, since it is smaller than the sum of its proper divisors (197652546).

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

82563390 is a wasteful number, since it uses less digits than its factorization.

82563390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 82563390 is about 9086.4398969013. The cubic root of 82563390 is about 435.4408531037.

The spelling of 82563390 in words is "eighty-two million, five hundred sixty-three thousand, three hundred ninety".