978689042 has 8 divisors (see below), whose sum is σ = 1518655500. Its totient is φ = 472470544.

The previous prime is 978689009. The next prime is 978689053. The reversal of 978689042 is 240986879.

It can be written as a sum of positive squares in 2 ways, for example, as 904746241 + 73942801 = 30079^2 + 8599^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 8436917 + ... + 8437032.

Almost surely, 2^978689042 is an apocalyptic number.

978689042 is a deficient number, since it is larger than the sum of its proper divisors (539966458).

978689042 is a wasteful number, since it uses less digits than its factorization.

978689042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16873980.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 978689042 is about 31284.0061692872. The cubic root of 978689042 is about 992.8452793898.

The spelling of 978689042 in words is "nine hundred seventy-eight million, six hundred eighty-nine thousand, forty-two".