87609618 has 24 divisors (see below), whose sum is σ = 190507356. Its totient is φ = 29097600.

The previous prime is 87609617. The next prime is 87609629. The reversal of 87609618 is 81690678.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 87553449 + 56169 = 9357^2 + 237^2 .

It is a super-2 number, since 2×87609618² = 15350890332211848, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (87609617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3603 + ... + 13718.

Almost surely, 2^87609618 is an apocalyptic number.

87609618 is an abundant number, since it is smaller than the sum of its proper divisors (102897738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87609618 is a wasteful number, since it uses less digits than its factorization.

87609618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17610 (or 17607 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 87609618 is about 9360.0009615384. Note that the first 3 decimals coincide. The cubic root of 87609618 is about 444.1373144804.

The spelling of 87609618 in words is "eighty-seven million, six hundred nine thousand, six hundred eighteen".