978766487 has 4 divisors (see below), whose sum is σ = 978831240. Its totient is φ = 978701736.

The previous prime is 978766463. The next prime is 978766489. The reversal of 978766487 is 784667879.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 978766487 - 2⁸ = 978766231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978766489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3689 + ... + 44397.

It is an arithmetic number, because the mean of its divisors is an integer number (244707810).

Almost surely, 2^978766487 is an apocalyptic number.

978766487 is a deficient number, since it is larger than the sum of its proper divisors (64753).

978766487 is a wasteful number, since it uses less digits than its factorization.

978766487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64752.

The product of its digits is 28449792, while the sum is 62.

The square root of 978766487 is about 31285.2439178601. The cubic root of 978766487 is about 992.8714670998.

The spelling of 978766487 in words is "nine hundred seventy-eight million, seven hundred sixty-six thousand, four hundred eighty-seven".