87378619 has 2 divisors, whose sum is σ = 87378620. Its totient is φ = 87378618.

The previous prime is 87378617. The next prime is 87378689. The reversal of 87378619 is 91687378.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87378619 - 2¹ = 87378617 is a prime.

It is a super-2 number, since 2×87378619² = 15270046116694322, which contains 22 as substring.

Together with 87378617, it forms a pair of twin primes.

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, 43689309 + 43689310.

It is an arithmetic number, because the mean of its divisors is an integer number (43689310).

Almost surely, 2^87378619 is an apocalyptic number.

87378619 is a deficient number, since it is larger than the sum of its proper divisors (1).

87378619 is an equidigital number, since it uses as much as digits as its factorization.

87378619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 87378619 is about 9347.6531279247. The cubic root of 87378619 is about 443.7466207770.

The spelling of 87378619 in words is "eighty-seven million, three hundred seventy-eight thousand, six hundred nineteen".