87219787 has 2 divisors, whose sum is σ = 87219788. Its totient is φ = 87219786.

The previous prime is 87219779. The next prime is 87219799. The reversal of 87219787 is 78791278.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87219787 - 2³ = 87219779 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87219787.

It is not a weakly prime, because it can be changed into another prime (87219757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43609893 + 43609894.

It is an arithmetic number, because the mean of its divisors is an integer number (43609894).

Almost surely, 2^87219787 is an apocalyptic number.

87219787 is a deficient number, since it is larger than the sum of its proper divisors (1).

87219787 is an equidigital number, since it uses as much as digits as its factorization.

87219787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 49.

The square root of 87219787 is about 9339.1534412922. The cubic root of 87219787 is about 443.4775850456.

The spelling of 87219787 in words is "eighty-seven million, two hundred nineteen thousand, seven hundred eighty-seven".