978428587 has 2 divisors, whose sum is σ = 978428588. Its totient is φ = 978428586.

The previous prime is 978428573. The next prime is 978428611. The reversal of 978428587 is 785824879.

978428587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978428587 is a prime.

It is not a weakly prime, because it can be changed into another prime (978428987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489214293 + 489214294.

It is an arithmetic number, because the mean of its divisors is an integer number (489214294).

Almost surely, 2^978428587 is an apocalyptic number.

978428587 is a deficient number, since it is larger than the sum of its proper divisors (1).

978428587 is an equidigital number, since it uses as much as digits as its factorization.

978428587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9031680, while the sum is 58.

The square root of 978428587 is about 31279.8431421898. The cubic root of 978428587 is about 992.7571974595.

The spelling of 978428587 in words is "nine hundred seventy-eight million, four hundred twenty-eight thousand, five hundred eighty-seven".