87660845 has 4 divisors (see below), whose sum is σ = 105193020. Its totient is φ = 70128672.

The previous prime is 87660841. The next prime is 87660847. The reversal of 87660845 is 54806678.

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 25140196 + 62520649 = 5014^2 + 7907^2 .

It is a cyclic number.

It is not a de Polignac number, because 87660845 - 2² = 87660841 is a prime.

It is a super-2 number, since 2×87660845² = 15368847492228050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 87660796 and 87660805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87660841) 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, 8766080 + ... + 8766089.

It is an arithmetic number, because the mean of its divisors is an integer number (26298255).

Almost surely, 2^87660845 is an apocalyptic number.

It is an amenable number.

87660845 is a deficient number, since it is larger than the sum of its proper divisors (17532175).

87660845 is a wasteful number, since it uses less digits than its factorization.

87660845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17532174.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 87660845 is about 9362.7370463983. The cubic root of 87660845 is about 444.2238627753.

The spelling of 87660845 in words is "eighty-seven million, six hundred sixty thousand, eight hundred forty-five".