87021225 has 36 divisors (see below), whose sum is σ = 160092556. Its totient is φ = 45152640.

The previous prime is 87021223. The next prime is 87021227. The reversal of 87021225 is 52212078.

It is an interprime number because it is at equal distance from previous prime (87021223) and next prime (87021227).

It can be written as a sum of positive squares in 6 ways, for example, as 13816089 + 73205136 = 3717^2 + 8556^2 .

It is not a de Polignac number, because 87021225 - 2¹ = 87021223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87021223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3099 + ... + 13551.

Almost surely, 2^87021225 is an apocalyptic number.

It is an amenable number.

87021225 is a deficient number, since it is larger than the sum of its proper divisors (73071331).

87021225 is a wasteful number, since it uses less digits than its factorization.

87021225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10506 (or 10498 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 87021225 is about 9328.5167631301. The cubic root of 87021225 is about 443.1407933336.

The spelling of 87021225 in words is "eighty-seven million, twenty-one thousand, two hundred twenty-five".