87403805 has 18 divisors (see below), whose sum is σ = 108758286. Its totient is φ = 67431168.

The previous prime is 87403763. The next prime is 87403831. The reversal of 87403805 is 50830478.

It can be written as a sum of positive squares in 9 ways, for example, as 32924644 + 54479161 = 5738^2 + 7381^2 .

It is not a de Polignac number, because 87403805 - 2⁶ = 87403741 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 773429 + ... + 773541.

It is an arithmetic number, because the mean of its divisors is an integer number (6042127).

Almost surely, 2^87403805 is an apocalyptic number.

It is an amenable number.

87403805 is a deficient number, since it is larger than the sum of its proper divisors (21354481).

87403805 is an equidigital number, since it uses as much as digits as its factorization.

87403805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 87403805 is about 9349.0002139266. Note that the first 3 decimals coincide. The cubic root of 87403805 is about 443.7892518344.

The spelling of 87403805 in words is "eighty-seven million, four hundred three thousand, eight hundred five".