78745898 has 16 divisors (see below), whose sum is σ = 147265344. Its totient is φ = 30680160.

The previous prime is 78745847. The next prime is 78745907. The reversal of 78745898 is 89854787.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255515 + ... + 255822.

It is an arithmetic number, because the mean of its divisors is an integer number (9204084).

Almost surely, 2^78745898 is an apocalyptic number.

78745898 is a deficient number, since it is larger than the sum of its proper divisors (68519446).

78745898 is a wasteful number, since it uses less digits than its factorization.

78745898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511357.

The product of its digits is 4515840, while the sum is 56.

The square root of 78745898 is about 8873.8885501228. Note that the first 3 decimals coincide. The cubic root of 78745898 is about 428.6235016832.

Subtracting 78745898 from its reverse (89854787), we obtain a square (11108889 = 3333²).

The spelling of 78745898 in words is "seventy-eight million, seven hundred forty-five thousand, eight hundred ninety-eight".