87215525 has 12 divisors (see below), whose sum is σ = 114509412. Its totient is φ = 65667840.

The previous prime is 87215507. The next prime is 87215533. The reversal of 87215525 is 52551278.

It can be written as a sum of positive squares in 6 ways, for example, as 12859396 + 74356129 = 3586^2 + 8623^2 .

It is not a de Polignac number, because 87215525 - 2¹² = 87211429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102182 + ... + 103031.

It is an arithmetic number, because the mean of its divisors is an integer number (9542451).

Almost surely, 2^87215525 is an apocalyptic number.

87215525 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87215525 is a deficient number, since it is larger than the sum of its proper divisors (27293887).

87215525 is a wasteful number, since it uses less digits than its factorization.

87215525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205240 (or 205235 counting only the distinct ones).

The product of its digits is 28000, while the sum is 35.

The square root of 87215525 is about 9338.9252593647. The cubic root of 87215525 is about 443.4703614085.

The spelling of 87215525 in words is "eighty-seven million, two hundred fifteen thousand, five hundred twenty-five".