78863281 has 16 divisors (see below), whose sum is σ = 95334400. Its totient is φ = 63728208.

The previous prime is 78863273. The next prime is 78863293. The reversal of 78863281 is 18236887.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78863281 - 2³ = 78863273 is a prime.

It is a super-2 number, since 2×78863281² = 12438834180169922, which contains 22 as substring.

It is the 8881-st Hogben number.

It is not an unprimeable number, because it can be changed into a prime (78863381) by changing a digit.

It is a nontrivial repunit in base 8880.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28330 + ... + 30988.

It is an arithmetic number, because the mean of its divisors is an integer number (5958400).

Almost surely, 2^78863281 is an apocalyptic number.

It is an amenable number.

78863281 is a deficient number, since it is larger than the sum of its proper divisors (16471119).

78863281 is a wasteful number, since it uses less digits than its factorization.

78863281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908.

The product of its digits is 129024, while the sum is 43.

The square root of 78863281 is about 8880.5000422274. The cubic root of 78863281 is about 428.8363725951.

The spelling of 78863281 in words is "seventy-eight million, eight hundred sixty-three thousand, two hundred eighty-one".