82521576 has 24 divisors (see below), whose sum is σ = 223496130. Its totient is φ = 27507168.

The previous prime is 82521529. The next prime is 82521577. The reversal of 82521576 is 67512528.

It is a happy number.

82521576 is a `hidden beast` number, since 82 + 5 + 2 + 1 + 576 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68459076 + 14062500 = 8274^2 + 3750^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 82521576.

It is not an unprimeable number, because it can be changed into a prime (82521577) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 572995 + ... + 573138.

Almost surely, 2^82521576 is an apocalyptic number.

It is an amenable number.

82521576 is an abundant number, since it is smaller than the sum of its proper divisors (140974554).

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

82521576 is a wasteful number, since it uses less digits than its factorization.

82521576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1146145 (or 1146138 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 82521576 is about 9084.1387043572. The cubic root of 82521576 is about 435.3673314197.

The spelling of 82521576 in words is "eighty-two million, five hundred twenty-one thousand, five hundred seventy-six".