87105904 has 20 divisors (see below), whose sum is σ = 169398880. Its totient is φ = 43390080.

The previous prime is 87105901. The next prime is 87105911. The reversal of 87105904 is 40950178.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 87105904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87105901) 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, 5709 + ... + 14380.

It is an arithmetic number, because the mean of its divisors is an integer number (8469944).

Almost surely, 2^87105904 is an apocalyptic number.

It is an amenable number.

87105904 is a deficient number, since it is larger than the sum of its proper divisors (82292976).

87105904 is a wasteful number, since it uses less digits than its factorization.

87105904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20368 (or 20362 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 87105904 is about 9333.0543767836. The cubic root of 87105904 is about 443.2844845393.

The spelling of 87105904 in words is "eighty-seven million, one hundred five thousand, nine hundred four".