87444520 has 16 divisors (see below), whose sum is σ = 196750260. Its totient is φ = 34977792.

The previous prime is 87444509. The next prime is 87444571. The reversal of 87444520 is 2544478.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 82700836 + 4743684 = 9094^2 + 2178^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1093017 + ... + 1093096.

Almost surely, 2^87444520 is an apocalyptic number.

It is an amenable number.

87444520 is an abundant number, since it is smaller than the sum of its proper divisors (109305740).

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

87444520 is a wasteful number, since it uses less digits than its factorization.

87444520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186124 (or 2186120 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 87444520 is about 9351.1774659665. The cubic root of 87444520 is about 443.8581507206.

Adding to 87444520 its reverse (2544478), we get a palindrome (89988998).

The spelling of 87444520 in words is "eighty-seven million, four hundred forty-four thousand, five hundred twenty".