978107642 has 4 divisors (see below), whose sum is σ = 1467161466. Its totient is φ = 489053820.

The previous prime is 978107639. The next prime is 978107653. The reversal of 978107642 is 246701879.

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

It can be written as a sum of positive squares in only one way, i.e., 970384801 + 7722841 = 31151^2 + 2779^2 .

It is a junction number, because it is equal to n+sod(n) for n = 978107593 and 978107602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244526909 + ... + 244526912.

Almost surely, 2^978107642 is an apocalyptic number.

978107642 is a deficient number, since it is larger than the sum of its proper divisors (489053824).

978107642 is a wasteful number, since it uses less digits than its factorization.

978107642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489053823.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 978107642 is about 31274.7125006770. The cubic root of 978107642 is about 992.6486372275.

The spelling of 978107642 in words is "nine hundred seventy-eight million, one hundred seven thousand, six hundred forty-two".