87978419 has 2 divisors, whose sum is σ = 87978420. Its totient is φ = 87978418.

The previous prime is 87978367. The next prime is 87978461. The reversal of 87978419 is 91487978.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87978419 - 2¹² = 87974323 is a prime.

It is a super-2 number, since 2×87978419² = 15480404419479122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87978469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43989209 + 43989210.

It is an arithmetic number, because the mean of its divisors is an integer number (43989210).

Almost surely, 2^87978419 is an apocalyptic number.

87978419 is a deficient number, since it is larger than the sum of its proper divisors (1).

87978419 is an equidigital number, since it uses as much as digits as its factorization.

87978419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 87978419 is about 9379.6811779506. The cubic root of 87978419 is about 444.7596547515.

The spelling of 87978419 in words is "eighty-seven million, nine hundred seventy-eight thousand, four hundred nineteen".