78841905 has 16 divisors (see below), whose sum is σ = 126584640. Its totient is φ = 41903168.

The previous prime is 78841871. The next prime is 78841909. The reversal of 78841905 is 50914887.

It is a cyclic number.

It is not a de Polignac number, because 78841905 - 2¹¹ = 78839857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78841909) 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, 4575 + ... + 13364.

It is an arithmetic number, because the mean of its divisors is an integer number (7911540).

Almost surely, 2^78841905 is an apocalyptic number.

It is an amenable number.

78841905 is a deficient number, since it is larger than the sum of its proper divisors (47742735).

78841905 is a wasteful number, since it uses less digits than its factorization.

78841905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18240.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 78841905 is about 8879.2964248301. The cubic root of 78841905 is about 428.7976235325.

The spelling of 78841905 in words is "seventy-eight million, eight hundred forty-one thousand, nine hundred five".