978175855 has 16 divisors (see below), whose sum is σ = 1229405184. Its totient is φ = 745731360.

The previous prime is 978175819. The next prime is 978175871. The reversal of 978175855 is 558571879.

It is a happy number.

It is not a de Polignac number, because 978175855 - 2²⁹ = 441304943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 978175796 and 978175805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15472 + ... + 46858.

It is an arithmetic number, because the mean of its divisors is an integer number (76837824).

Almost surely, 2^978175855 is an apocalyptic number.

978175855 is a deficient number, since it is larger than the sum of its proper divisors (251229329).

978175855 is a wasteful number, since it uses less digits than its factorization.

978175855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31686.

The product of its digits is 3528000, while the sum is 55.

The square root of 978175855 is about 31275.8030272605. The cubic root of 978175855 is about 992.6717123863.

The spelling of 978175855 in words is "nine hundred seventy-eight million, one hundred seventy-five thousand, eight hundred fifty-five".