978874685 has 4 divisors (see below), whose sum is σ = 1174649628. Its totient is φ = 783099744.

The previous prime is 978874619. The next prime is 978874703. The reversal of 978874685 is 586478879.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 585010969 + 393863716 = 24187^2 + 19846^2 .

It is a cyclic number.

It is not a de Polignac number, because 978874685 - 2²⁴ = 962097469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97887464 + ... + 97887473.

It is an arithmetic number, because the mean of its divisors is an integer number (293662407).

Almost surely, 2^978874685 is an apocalyptic number.

It is an amenable number.

978874685 is a deficient number, since it is larger than the sum of its proper divisors (195774943).

978874685 is a wasteful number, since it uses less digits than its factorization.

978874685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195774942.

The product of its digits is 27095040, while the sum is 62.

The square root of 978874685 is about 31286.9730878524. The cubic root of 978874685 is about 992.9080514980.

The spelling of 978874685 in words is "nine hundred seventy-eight million, eight hundred seventy-four thousand, six hundred eighty-five".