8778257993 has 16 divisors (see below), whose sum is σ = 9314870400. Its totient is φ = 8255744640.

The previous prime is 8778257981. The next prime is 8778258011. The reversal of 8778257993 is 3997528778.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8778257993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8778257903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315053 + ... + 341781.

It is an arithmetic number, because the mean of its divisors is an integer number (582179400).

Almost surely, 2^8778257993 is an apocalyptic number.

It is an amenable number.

8778257993 is a deficient number, since it is larger than the sum of its proper divisors (536612407).

8778257993 is a wasteful number, since it uses less digits than its factorization.

8778257993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26992.

The product of its digits is 53343360, while the sum is 65.

The square root of 8778257993 is about 93692.3582422814. The cubic root of 8778257993 is about 2062.8585376719.

The spelling of 8778257993 in words is "eight billion, seven hundred seventy-eight million, two hundred fifty-seven thousand, nine hundred ninety-three".