978883775 has 12 divisors (see below), whose sum is σ = 1233716424. Its totient is φ = 770268000.

The previous prime is 978883771. The next prime is 978883813. The reversal of 978883775 is 577388879.

It is not a de Polignac number, because 978883775 - 2² = 978883771 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 (978883771) 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 11 ways as a sum of consecutive naturals, for example, 319421 + ... + 322470.

It is an arithmetic number, because the mean of its divisors is an integer number (102809702).

Almost surely, 2^978883775 is an apocalyptic number.

978883775 is a deficient number, since it is larger than the sum of its proper divisors (254832649).

978883775 is a wasteful number, since it uses less digits than its factorization.

978883775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641962 (or 641957 counting only the distinct ones).

The product of its digits is 23708160, while the sum is 62.

The square root of 978883775 is about 31287.1183556428. The cubic root of 978883775 is about 992.9111249273.

The spelling of 978883775 in words is "nine hundred seventy-eight million, eight hundred eighty-three thousand, seven hundred seventy-five".