87378617 has 2 divisors, whose sum is σ = 87378618. Its totient is φ = 87378616.

The previous prime is 87378611. The next prime is 87378619. The reversal of 87378617 is 71687378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83521321 + 3857296 = 9139^2 + 1964^2 .

It is a cyclic number.

It is not a de Polignac number, because 87378617 - 2⁴ = 87378601 is a prime.

It is a super-3 number, since 3×87378617³ (a number of 25 digits) contains 333 as substring.

Together with 87378619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87378611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43689308 + 43689309.

It is an arithmetic number, because the mean of its divisors is an integer number (43689309).

Almost surely, 2^87378617 is an apocalyptic number.

It is an amenable number.

87378617 is a deficient number, since it is larger than the sum of its proper divisors (1).

87378617 is an equidigital number, since it uses as much as digits as its factorization.

87378617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The square root of 87378617 is about 9347.6530209460. The cubic root of 87378617 is about 443.7466173914.

The spelling of 87378617 in words is "eighty-seven million, three hundred seventy-eight thousand, six hundred seventeen".