87539940 has 60 divisors (see below), whose sum is σ = 274621116. Its totient is φ = 23343552.

The previous prime is 87539929. The next prime is 87539981. The reversal of 87539940 is 4993578.

It can be written as a sum of positive squares in 2 ways, for example, as 61591104 + 25948836 = 7848^2 + 5094^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 25399 + ... + 28638.

Almost surely, 2^87539940 is an apocalyptic number.

It is an amenable number.

87539940 is an abundant number, since it is smaller than the sum of its proper divisors (187081176).

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

87539940 is a wasteful number, since it uses less digits than its factorization.

87539940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54058 (or 54047 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 87539940 is about 9356.2781061702. The cubic root of 87539940 is about 444.0195389502.

The spelling of 87539940 in words is "eighty-seven million, five hundred thirty-nine thousand, nine hundred forty".