87308947 has 4 divisors (see below), whose sum is σ = 95246136. Its totient is φ = 79371760.

The previous prime is 87308941. The next prime is 87308999. The reversal of 87308947 is 74980378.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87308947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87308897 and 87308906.

It is not an unprimeable number, because it can be changed into a prime (87308941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3968578 + ... + 3968599.

It is an arithmetic number, because the mean of its divisors is an integer number (23811534).

Almost surely, 2^87308947 is an apocalyptic number.

87308947 is a deficient number, since it is larger than the sum of its proper divisors (7937189).

87308947 is a wasteful number, since it uses less digits than its factorization.

87308947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7937188.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 87308947 is about 9343.9256739338. The cubic root of 87308947 is about 443.6286478458.

The spelling of 87308947 in words is "eighty-seven million, three hundred eight thousand, nine hundred forty-seven".