87987940 has 12 divisors (see below), whose sum is σ = 184774716. Its totient is φ = 35195168.

The previous prime is 87987929. The next prime is 87987941. The reversal of 87987940 is 4978978.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10407076 + 77580864 = 3226^2 + 8808^2 .

It is not an unprimeable number, because it can be changed into a prime (87987941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2199679 + ... + 2199718.

It is an arithmetic number, because the mean of its divisors is an integer number (15397893).

Almost surely, 2^87987940 is an apocalyptic number.

It is an amenable number.

87987940 is an abundant number, since it is smaller than the sum of its proper divisors (96786776).

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

87987940 is a wasteful number, since it uses less digits than its factorization.

87987940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399406 (or 4399404 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 87987940 is about 9380.1886974623. The cubic root of 87987940 is about 444.7756980948.

The spelling of 87987940 in words is "eighty-seven million, nine hundred eighty-seven thousand, nine hundred forty".