978966791 has 8 divisors (see below), whose sum is σ = 1075760784. Its totient is φ = 883472320.

The previous prime is 978966787. The next prime is 978966817. The reversal of 978966791 is 197669879.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 978966791 - 2² = 978966787 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 (978966721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323300 + ... + 326313.

It is an arithmetic number, because the mean of its divisors is an integer number (134470098).

Almost surely, 2^978966791 is an apocalyptic number.

978966791 is a deficient number, since it is larger than the sum of its proper divisors (96793993).

978966791 is a wasteful number, since it uses less digits than its factorization.

978966791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649761.

The product of its digits is 10287648, while the sum is 62.

The square root of 978966791 is about 31288.4450077021. The cubic root of 978966791 is about 992.9391926721.

It can be divided in two parts, 978 and 966791, that added together give a palindrome (967769).

The spelling of 978966791 in words is "nine hundred seventy-eight million, nine hundred sixty-six thousand, seven hundred ninety-one".