87385840 has 40 divisors (see below), whose sum is σ = 203634288. Its totient is φ = 34874880.

The previous prime is 87385829. The next prime is 87385849. The reversal of 87385840 is 4858378.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87385849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44724 + ... + 46636.

Almost surely, 2^87385840 is an apocalyptic number.

87385840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87385840 is an abundant number, since it is smaller than the sum of its proper divisors (116248448).

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

87385840 is a wasteful number, since it uses less digits than its factorization.

87385840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497 (or 2491 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The square root of 87385840 is about 9348.0393666266. The cubic root of 87385840 is about 443.7588442329.

The spelling of 87385840 in words is "eighty-seven million, three hundred eighty-five thousand, eight hundred forty".