87218077 has 2 divisors, whose sum is σ = 87218078. Its totient is φ = 87218076.

The previous prime is 87218071. The next prime is 87218099. The reversal of 87218077 is 77081278.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87216921 + 1156 = 9339^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 87218077 - 2³ = 87218069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87218071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43609038 + 43609039.

It is an arithmetic number, because the mean of its divisors is an integer number (43609039).

Almost surely, 2^87218077 is an apocalyptic number.

It is an amenable number.

87218077 is a deficient number, since it is larger than the sum of its proper divisors (1).

87218077 is an equidigital number, since it uses as much as digits as its factorization.

87218077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43904, while the sum is 40.

The square root of 87218077 is about 9339.0618907897. The cubic root of 87218077 is about 443.4746868056.

The spelling of 87218077 in words is "eighty-seven million, two hundred eighteen thousand, seventy-seven".