84278587 has 2 divisors, whose sum is σ = 84278588. Its totient is φ = 84278586.

The previous prime is 84278549. The next prime is 84278591. The reversal of 84278587 is 78587248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84278587 - 2⁷ = 84278459 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 84278587.

It is not a weakly prime, because it can be changed into another prime (84218587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42139293 + 42139294.

It is an arithmetic number, because the mean of its divisors is an integer number (42139294).

Almost surely, 2^84278587 is an apocalyptic number.

84278587 is a deficient number, since it is larger than the sum of its proper divisors (1).

84278587 is an equidigital number, since it uses as much as digits as its factorization.

84278587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1003520, while the sum is 49.

The square root of 84278587 is about 9180.3369763860. The cubic root of 84278587 is about 438.4355373135.

The spelling of 84278587 in words is "eighty-four million, two hundred seventy-eight thousand, five hundred eighty-seven".