87020257 has 2 divisors, whose sum is σ = 87020258. Its totient is φ = 87020256.

The previous prime is 87020251. The next prime is 87020299. The reversal of 87020257 is 75202078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65869456 + 21150801 = 8116^2 + 4599^2 .

It is a cyclic number.

It is not a de Polignac number, because 87020257 - 2³ = 87020249 is a prime.

It is not a weakly prime, because it can be changed into another prime (87020251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43510128 + 43510129.

It is an arithmetic number, because the mean of its divisors is an integer number (43510129).

Almost surely, 2^87020257 is an apocalyptic number.

It is an amenable number.

87020257 is a deficient number, since it is larger than the sum of its proper divisors (1).

87020257 is an equidigital number, since it uses as much as digits as its factorization.

87020257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 87020257 is about 9328.4648790677. The cubic root of 87020257 is about 443.1391502023.

The spelling of 87020257 in words is "eighty-seven million, twenty thousand, two hundred fifty-seven".