87100745 has 4 divisors (see below), whose sum is σ = 104520900. Its totient is φ = 69680592.

The previous prime is 87100723. The next prime is 87100751. The reversal of 87100745 is 54700178.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15241216 + 71859529 = 3904^2 + 8477^2 .

It is a cyclic number.

It is not a de Polignac number, because 87100745 - 2²² = 82906441 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8710070 + ... + 8710079.

It is an arithmetic number, because the mean of its divisors is an integer number (26130225).

Almost surely, 2^87100745 is an apocalyptic number.

It is an amenable number.

87100745 is a deficient number, since it is larger than the sum of its proper divisors (17420155).

87100745 is a wasteful number, since it uses less digits than its factorization.

87100745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17420154.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 87100745 is about 9332.7779894306. Note that the first 3 decimals coincide. The cubic root of 87100745 is about 443.2757329328.

The spelling of 87100745 in words is "eighty-seven million, one hundred thousand, seven hundred forty-five".