978691375 has 16 divisors (see below), whose sum is σ = 1244460672. Its totient is φ = 768175200.

The previous prime is 978691367. The next prime is 978691379. The reversal of 978691375 is 573196879.

It is not a de Polignac number, because 978691375 - 2³ = 978691367 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 (978691379) 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 15 ways as a sum of consecutive naturals, for example, 67239 + ... + 80488.

It is an arithmetic number, because the mean of its divisors is an integer number (77778792).

Almost surely, 2^978691375 is an apocalyptic number.

978691375 is a deficient number, since it is larger than the sum of its proper divisors (265769297).

978691375 is a wasteful number, since it uses less digits than its factorization.

978691375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147795 (or 147785 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 55.

The square root of 978691375 is about 31284.0434566889. The cubic root of 978691375 is about 992.8460683044.

The spelling of 978691375 in words is "nine hundred seventy-eight million, six hundred ninety-one thousand, three hundred seventy-five".