87640443 has 12 divisors (see below), whose sum is σ = 138100248. Its totient is φ = 53115360.

The previous prime is 87640439. The next prime is 87640451. The reversal of 87640443 is 34404678.

87640443 is a `hidden beast` number, since 8 + 7 + 640 + 4 + 4 + 3 = 666.

It is not a de Polignac number, because 87640443 - 2² = 87640439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87640398 and 87640407.

It is not an unprimeable number, because it can be changed into a prime (87640403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 442530 + ... + 442727.

It is an arithmetic number, because the mean of its divisors is an integer number (11508354).

Almost surely, 2^87640443 is an apocalyptic number.

87640443 is a deficient number, since it is larger than the sum of its proper divisors (50459805).

87640443 is a wasteful number, since it uses less digits than its factorization.

87640443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885274 (or 885271 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 36.

The square root of 87640443 is about 9361.6474511701. The cubic root of 87640443 is about 444.1893975267.

The spelling of 87640443 in words is "eighty-seven million, six hundred forty thousand, four hundred forty-three".