879545978 has 4 divisors (see below), whose sum is σ = 1319318970. Its totient is φ = 439772988.

The previous prime is 879545977. The next prime is 879545999.

879545978 is nontrivially palindromic in base 10.

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., 478865689 + 400680289 = 21883^2 + 20017^2 .

It is a super-2 number, since 2×879545978² = 1547202254831952968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 879545978.

It is not an unprimeable number, because it can be changed into a prime (879545977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219886493 + ... + 219886496.

Almost surely, 2^879545978 is an apocalyptic number.

879545978 is a deficient number, since it is larger than the sum of its proper divisors (439772992).

879545978 is a wasteful number, since it uses less digits than its factorization.

879545978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439772991.

The product of its digits is 25401600, while the sum is 62.

The square root of 879545978 is about 29657.1404218276. The cubic root of 879545978 is about 958.1191392719.

The spelling of 879545978 in words is "eight hundred seventy-nine million, five hundred forty-five thousand, nine hundred seventy-eight".