87309225 has 24 divisors (see below), whose sum is σ = 160391520. Its totient is φ = 46564560.

The previous prime is 87309223. The next prime is 87309253. The reversal of 87309225 is 52290378.

It is a happy number.

It is not a de Polignac number, because 87309225 - 2¹ = 87309223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87309225.

It is not an unprimeable number, because it can be changed into a prime (87309223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63999 + ... + 65348.

It is an arithmetic number, because the mean of its divisors is an integer number (6682980).

Almost surely, 2^87309225 is an apocalyptic number.

It is an amenable number.

87309225 is a deficient number, since it is larger than the sum of its proper divisors (73082295).

87309225 is a wasteful number, since it uses less digits than its factorization.

87309225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129366 (or 129355 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 87309225 is about 9343.9405498965. The cubic root of 87309225 is about 443.6291186972.

It can be divided in two parts, 8730 and 9225, that added together give a triangular number (17955 = T₁₈₉).

The spelling of 87309225 in words is "eighty-seven million, three hundred nine thousand, two hundred twenty-five".