87820529 has 2 divisors, whose sum is σ = 87820530. Its totient is φ = 87820528.

The previous prime is 87820517. The next prime is 87820547. The reversal of 87820529 is 92502878.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79566400 + 8254129 = 8920^2 + 2873^2 .

It is a cyclic number.

It is not a de Polignac number, because 87820529 - 2¹² = 87816433 is a prime.

It is not a weakly prime, because it can be changed into another prime (87828529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43910264 + 43910265.

It is an arithmetic number, because the mean of its divisors is an integer number (43910265).

Almost surely, 2^87820529 is an apocalyptic number.

It is an amenable number.

87820529 is a deficient number, since it is larger than the sum of its proper divisors (1).

87820529 is an equidigital number, since it uses as much as digits as its factorization.

87820529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 87820529 is about 9371.2608009808. The cubic root of 87820529 is about 444.4934335837.

The spelling of 87820529 in words is "eighty-seven million, eight hundred twenty thousand, five hundred twenty-nine".