978566 has 4 divisors (see below), whose sum is σ = 1467852. Its totient is φ = 489282.

The previous prime is 978541. The next prime is 978569. The reversal of 978566 is 665879.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 665879 = 607 ⋅1097.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244640 + ... + 244643.

It is an arithmetic number, because the mean of its divisors is an integer number (366963).

2⁹⁷⁸⁵⁶⁶ is an apocalyptic number.

978566 is a deficient number, since it is larger than the sum of its proper divisors (489286).

978566 is a wasteful number, since it uses less digits than its factorization.

978566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489285.

The product of its digits is 90720, while the sum is 41.

The square root of 978566 is about 989.2249491395. The cubic root of 978566 is about 99.2803670399.

The spelling of 978566 in words is "nine hundred seventy-eight thousand, five hundred sixty-six".