87215647 has 2 divisors, whose sum is σ = 87215648. Its totient is φ = 87215646.

The previous prime is 87215603. The next prime is 87215657. The reversal of 87215647 is 74651278.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87215647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87215657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43607823 + 43607824.

It is an arithmetic number, because the mean of its divisors is an integer number (43607824).

Almost surely, 2^87215647 is an apocalyptic number.

87215647 is a deficient number, since it is larger than the sum of its proper divisors (1).

87215647 is an equidigital number, since it uses as much as digits as its factorization.

87215647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 40.

The square root of 87215647 is about 9338.9317911633. The cubic root of 87215647 is about 443.4705681888.

The spelling of 87215647 in words is "eighty-seven million, two hundred fifteen thousand, six hundred forty-seven".