878126993 has 4 divisors (see below), whose sum is σ = 929781540. Its totient is φ = 826472448.

The previous prime is 878126983. The next prime is 878127007. The reversal of 878126993 is 399621878.

878126993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 460660369 + 417466624 = 21463^2 + 20432^2 .

It is a cyclic number.

It is not a de Polignac number, because 878126993 - 2¹² = 878122897 is a prime.

It is a super-2 number, since 2×878126993² = 1542214031670444098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878126983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25827248 + ... + 25827281.

It is an arithmetic number, because the mean of its divisors is an integer number (232445385).

Almost surely, 2^878126993 is an apocalyptic number.

It is an amenable number.

878126993 is a deficient number, since it is larger than the sum of its proper divisors (51654547).

878126993 is a wasteful number, since it uses less digits than its factorization.

878126993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51654546.

The product of its digits is 1306368, while the sum is 53.

The square root of 878126993 is about 29633.2076056575. The cubic root of 878126993 is about 957.6036125085.

The spelling of 878126993 in words is "eight hundred seventy-eight million, one hundred twenty-six thousand, nine hundred ninety-three".