87478609 has 9 divisors (see below), whose sum is σ = 89830857. Its totient is φ = 85187124.

The previous prime is 87478561. The next prime is 87478613. The reversal of 87478609 is 90687478.

The square root of 87478609 is 9353.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 87478609 - 2¹³ = 87470417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87478649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 439492 + ... + 439690.

Almost surely, 2^87478609 is an apocalyptic number.

87478609 is the 9353-rd square number.

87478609 is the 4677-th centered octagonal number.

It is an amenable number.

87478609 is a deficient number, since it is larger than the sum of its proper divisors (2352248).

87478609 is an frugal number, since it uses more digits than its factorization.

87478609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The cubic root of 87478609 is about 443.9158204857.

Multiplying 87478609 by its sum of digits (49), we get a square (4286451841 = 65471²).

The spelling of 87478609 in words is "eighty-seven million, four hundred seventy-eight thousand, six hundred nine".