978115867 has 4 divisors (see below), whose sum is σ = 979359496. Its totient is φ = 976872240.

The previous prime is 978115861. The next prime is 978115891. The reversal of 978115867 is 768511879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768511879 = 887 ⋅866417.

It is a cyclic number.

It is not a de Polignac number, because 978115867 - 2⁷ = 978115739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978115861) 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, 620634 + ... + 622207.

It is an arithmetic number, because the mean of its divisors is an integer number (244839874).

Almost surely, 2^978115867 is an apocalyptic number.

978115867 is a deficient number, since it is larger than the sum of its proper divisors (1243629).

978115867 is a wasteful number, since it uses less digits than its factorization.

978115867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243628.

The product of its digits is 846720, while the sum is 52.

The square root of 978115867 is about 31274.8439964135. The cubic root of 978115867 is about 992.6514196452.

The spelling of 978115867 in words is "nine hundred seventy-eight million, one hundred fifteen thousand, eight hundred sixty-seven".